A few days ago I found out that openai released gpt 4o-mini and I wanted to use this model in my project. So I reinstalled llamaindex and was able to get this model working. From the project, it is a chatbot that reads data from a json file that contains the car data that I specified.

const { OpenAI } = require("llamaindex");
const fs = require("fs").promises;
const { Document, VectorStoreIndex, QueryEngineTool, OpenAIAgent, Settings } = require("llamaindex");
const readlineSync = require("readline-sync");
const path = require("path");

const dataPath = "data/old_nissan.json";
const errorLogFolder = "error_log";

async function main() {
    try {
        // Ensure error log directory exists
        await fs.mkdir(errorLogFolder, { recursive: true });

        // Setup OpenAI and callback events
        Settings.llm = new OpenAI({ model: "gpt-4o-mini" });
        Settings.callbackManager.on("llm-tool-call", (event) => {
            console.log("llm-tool-call :", event.detail.payload);
        });
        Settings.callbackManager.on("llm-tool-result", (event) => {
            console.log("llm-tool-result :", event.detail.payload);
        });

        // Read essay content from file
        const essay = await fs.readFile(dataPath, "utf-8");
        const document = new Document({ text: essay, id_: dataPath });

        // Create vector index from the document
        const index = await VectorStoreIndex.fromDocuments([document]);

        // Create query engine tool
        const individual_query_engine_tools = [
            new QueryEngineTool({
                queryEngine: index.asQueryEngine(),
                metadata: {
                    name: "vector_index",
                    description: `Useful when you want to answer questions about information about cars assembled in Thailand. You must specify details of the vehicles named in the list when user ask you.`,
                },
            }),
        ];

        // Initialize OpenAIAgent with tools
        const agent = new OpenAIAgent({
            tools: [...individual_query_engine_tools],
            verbose: true,
        });

        while (true) {
            const userInput = readlineSync.question("Enter your question (type 'exit' to quit): ");
            if (userInput.toLowerCase() === 'exit') {
                console.log("Exiting...");
                break;
            } else if (userInput.toLowerCase() !== '') {
                const response = await agent.chat({
                    message: userInput,
                });
                console.log('------------------------------------------------------');
                console.log("Response : ");
                console.log(response);
                console.log('------------------------------------------------------');
            }
        }
    } catch (error) {
        console.error("An error occurred:", error);

        // Generate a unique filename for the error log
        const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
        const errorLogPath = path.join(errorLogFolder, `error_log_${timestamp}.txt`);

        // Write the error details to the log file
        await fs.writeFile(errorLogPath, `Error: ${error.message}nStack: ${error.stack}`);
    }
}

main().catch(console.error);

And when I press run, the program gives me a Syntax Error like this.

Error: Expected "http://", "https://", [ tnr], [([{"'`‘], [0-9], [^ tnr!?([}"`)]}"`0-9@], [^ tnr!?.([})]}`"0-9@], [a-z0-9], [a-z], or end of input but "}" found.
Stack: SyntaxError: Expected "http://", "https://", [ tnr], [([{"'`‘], [0-9], [^ tnr!?([}"`)]}"`0-9@], [^ tnr!?.([})]}`"0-9@], [a-z0-9], [a-z], or end of input but "}" found.
    at peg$buildStructuredError (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:473:24)
    at Object.peg$parse [as parse] (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1597:23)
    at SentenceTokenizer.tokenize (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1630:31)
    at E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1660:26
    at #getSplitsByFns (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1774:28)
    at #split (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1755:67)
    at Function._splitText (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1737:35)
    at Function.splitTextMetadataAware (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:1722:21)
    at E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:97:33
    at Array.reduce (<anonymous>)
    at Function.parseNodes (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:95:22)
    at Function.getNodesFromDocuments (E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:59:56)
    at E:js chatnode_modules@llamaindexcoredistnode-parserindex.cjs:10:25
    at transform (E:js chatnode_modules@llamaindexcoredistschemaindex.cjs:746:20)
    at runTransformations (E:js chatnode_modulesllamaindexdistcjsingestionIngestionPipeline.js:46:27)
    at async VectorStoreIndex.fromDocuments (E:js chatnode_modulesllamaindexdistcjsindicesvectorStoreindex.js:508:22)

When I encountered this issue, I thought maybe my code was not updated and some packages were no longer usable. But when I tried changing the data to a simple json format like this,

{
    "cars": [{
            "make": "Toyota",
            "model": "Corolla",
            "year": 2023,
            "type": "Sedan",
            "engine": "1.8L",
            "assembled_in": "Thailand"
        },
        {
            "make": "Honda",
            "model": "Civic",
            "year": 2023,
            "type": "Sedan",
            "engine": "1.5L Turbo",
            "assembled_in": "Thailand"
        },
        {
            "make": "Mitsubishi",
            "model": "Xpander",
            "year": 2023,
            "type": "SUV",
            "engine": "1.5L",
            "assembled_in": "Thailand"
        },
        {
            "make": "Mazda",
            "model": "CX-5",
            "year": 2023,
            "type": "SUV",
            "engine": "2.5L",
            "assembled_in": "Thailand"
        },
        {
            "make": "Isuzu",
            "model": "D-Max",
            "year": 2023,
            "type": "Truck",
            "engine": "3.0L",
            "assembled_in": "Thailand"
        }
    ]
}

When I run the code with this json data it works fine, but when I change it to my normal data like this

{
    "Car": "Car",
    "year": 2024,
    "active": true,
    "models": [{
            "Brand": "Nissan",
            "Model": "Almera 1.0L Turbo",
            "Year": 2024,
            "Price": "฿549,000 - ฿699,000",
            "Style": {
                "Color": "9 colornblack (black star) ,ngrey (gun metalic) ,ngrey (sky pearl) ,nwhite (strom white) ,nred (radiant red) ,nblue (night blue) ,nblack (black star) with black roof , nblack (black star) with black roof ,nblack (black star) with black roof",
                "Body Type": "Sedan",
                "Segment": "eco car",
                "Door": 4,
                "Seat": 4
            },
            "Performance": {
                "Gear": "auto",
                "Powered by": "gasoline",
                "Fuel type": "Benzene",
                "Fuel tank capacity, liters": 35,
                "Consumption rate": "23.3 kilometers/liter",
                "Cylinder volume, cc": 1000,
                "Horsepower": 100
            },
            "Feature": {
                "Safety System": "- Dual front SRS airbagsn- Side airbags (Side Airbags)n- Side Curtain Airbagsn- Anti-lock Braking System (ABS)n- Electronic Brake Force Distribution System (EBD)n- Brake Assist (BA) braking systemn- Immobilizer key systemn- Anti-theft alarmn- Central locking system control buttonn- ELR driver seat belt with retracting and automatic two-way tensioning (Double Pre-tensioner with Load Limiter)n- Front passenger seat belt ELR with pre-tensioner and automatic tension release (Single Pre-tensioner with Load Limiter)n- 3-point ELR rear seat belts, 3 positionsn- ISOFIX child seat mounting pointsn- Child protection system for opening rear doors from inside the vehiclen- Safety structure system Zone Body Conceptn- Third brake light",
                "Features": "- NISSANCONNECT SERVICESn-Tire Pressure Monitoring Sensor System (TPMS)n- High Beam Assist (HBA) automatic high beam on-off systemn- Warning system when the car leaves the lane Lane Departure Warning (LDW)n- Engine starting system from a remote key (Remote Engine Start)n- Black synthetic leather seatsn- Black cloth seats decorated with dark blue edges.n- Side mirrors the same color as the car electrically adjustablen- Intelligent Key - I-Keyn- Engine start button (Push Start Button)n- Dual front SRS airbagsn- Side Airbags and Side Curtain Airbagsn- Intelligent Forward Collision Warning (IFWC)n- Intelligent Emergency Braking (IEB) systemn- Control switch for automatic speed control (Cruise Control)n- Automatic air conditioning systemn- Side mirrors the same color as the car Electrically adjustable and foldable Automatically when locking the carn- 15"" alloy wheelsn- NISSANCONNECT SERVICESn- Intelligent Around View Monitor (IAVM)n- System for detecting and sending warning signals of moving objects and people from cameras around the car, Moving Object Detection (MOD)n- LED headlights with LED Signature Light and automatic headlight on-off system.n- Engine starting system from a remote key (Remote Engine Start)n- Wireless charging device"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "KICKSe-POWER",
            "Year": 2024,
            "Price": "฿779900 - ฿939,900",
            "Style": {
                "Color": "12 color nblack (black star) , nred (radiant red) , norange (monarch orange) , nsilver (brilliant silver) , nwhite (storm white) , ngrey (gun meatllic) , nblue (night blue) , nred (radiant red) with black roof , norange (monarch orange) with black roof , nwhite (storm white) with black roof , ngrey (gun meatllic) with black roof , nblue (night blue) with black roof",
                "Body Type": "SUV",
                "Segment": "hybrid (e:HEV)",
                "Door": 5,
                "Seat": 5
            },
            "Performance": {
                "Gear": "auto",
                "Powered by": "gasoline , electric",
                "Fuel type": "Benzene",
                "Fuel tank capacity, liters": 41,
                "Consumption rate": "26.3 kilometers/liter",
                "Cylinder volume, cc": 1200,
                "Horsepower": 136
            },
            "Feature": {
                "Safety System": "- Dual front SRS airbags n- Side airbags (Side Airbags) n- Side Curtain Airbags n- Anti-lock Braking System (ABS) n- Electronic Brake Force Distribution System (EBD) n- Brake Assist (BA) braking system n- Immobilizer key system n- Anti-theft alarm n- Central locking system control button n- ELR driver seat belt with retracting and automatic two-way tensioning (Double Pre-tensioner with Load Limiter) n- Front passenger seat belt ELR with pre-tensioner and automatic tension release (Single Pre-tensioner with Load Limiter) n- 3-point ELR rear seat belts, 3 positions n- ISOFIX child seat mounting points n- Child protection system for opening rear doors from inside the vehicle n- Safety structure system Zone Body Concept n- Third brake light",
                "Features": "- 6 airbags (Dual front SRS airbags, side airbags curtain airbag)n- Sporty leather-wrapped steering wheel decorated with silver material, adjustable in 4 directions.n- Rear parking distance warningn- Technology to help warn you when you're tired while driving Driver Attention Alert (DAA)n- Intelligent Forward Collision Warning (IFCW) technology to warn before collisions.n- Intelligent Emergency Braking (IEB) technologyn- Automatic headlight on-off systemn- NissanConnect 8-inch touch screen with Apple CarPlay and Android auto connectivityn- Intelligent Around View Monitor (IAVM) technology that detects and sends warning signals about moving objects. Moving Object Detection (MOD)n- Intelligent Cruise Control (ICC) technologyn- Intelligent Rear View Mirror (IRVM) technologyn- Technology to detect objects behind the car while reversing, Rear Cross Traffic Alert (RCTA)n- Technology to warn when the car leaves the Lane Departure Warning (LDW) lane.n- High Beam Assist (HBA) automatic high beam on-off technologyn- Alloy wheels 17 x 6.5 J, gloss black"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "TERRA SPORT",
            "Year": 2024,
            "Price": "฿1,199,000 - ฿1,555,000",
            "Style": {
                "Color": "7 colornblack (black star) ,nwhite (white pearl) ,nred (Coulis Red) ,ngrey (stealth grey) ,",
                "Body Type": "SUV",
                "Segment": "versatile",
                "Door": 5,
                "Seat": 7
            },
            "Performance": {
                "Gear": "auto",
                "Powered by": "gasoline",
                "Fuel type": "Diesel",
                "Fuel tank capacity, liters": 78,
                "Consumption rate": "14.43 kilometers/liter",
                "Cylinder volume, cc": 2300,
                "Horsepower": 190
            },
            "Feature": {
                "Safety System": "- ABS braking system with EBD and BAn- 6 airbags, front / side / and curtain airbagsn- B-LSD limited slip systemn- Vehicle Dynamic Control (VDC) automatic stability control technologyn- Rear window defogger wire paneln- Third brake light, LED typen- 1st row ELR seat belts, 3 points, 2 positions, adjustable. Equipped with an automatic pull-back and tension-relieving system. and a reminder system to fasten seat beltsn- 2nd row ELR seat belts, 3 points, 3 positionsn- 3rd row ELR seat belts, 3 points, 2 positionsn- ISOFIX child seat mounting pointsn- Intelligent key systemn- Immobilizer key system with anti-theft alarmn- Rear view cameran- 4 rear parking distance warning signsn- Zone Body safety structuren- Side impact beamsn- collapsible steering wheel When a frontal collision occursn- Automatic fuel valve cut-off system In the case of a car overturning",
                "Features": "- Quad-Eye LED headlights and Daytime lightsn- 8" touchscreen radio with Nissan Connect to connect to smartphonesn- The design allows the seat to be adjusted in many ways and the seat can be folded with just your fingertips with the Auto Tumble Seat.n- Smart TFT meter screen displays 7-inch 3D driving information with Off-Road Meter.n- 360 degree safety technology around the car (IFCW, IEB, LDW, IDA)n- 2.3 liter twin turbo diesel engine, 190 horsepower, with 7 speed automatic transmission - with manual mode"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "NAVARA PRO-4X / PRO-2X",
            "Year": 2024,
            "Price": "฿1,030,000-฿1,160,000",
            "Style": {
                "Color": "4 colorngrey (stealth grey) ,nblack (black star) , nwhite (white pearl) , nred (burning red)",
                "Body Type": "Pickup",
                "Segment": "versatile",
                "Door": 4,
                "Seat": 5
            },
            "Performance": {
                "Gear": "auto",
                "Powered by": "gasoline",
                "Fuel type": "Diesel",
                "Fuel tank capacity, liters": 80,
                "Consumption rate": "14.56 kilometers/liter",
                "Cylinder volume, cc": 2300,
                "Horsepower": 190
            },
            "Feature": {
                "Safety System": "- ABS with EBD and BAn- Rear Differential Lockn- Dual front airbag with driver knee airbag driver siden- Side airbag and Curtain airbagn- Active Brake Limited Slip (ABLS)n- Vehicle Dynamic Control (VDC)n- Traction Control System (TCS)n- Trailer Stability Assist (TSA)n- Rear defoggern- High mount stop lamp (LED Type)n- Adjustable Front seat belt: ELR 3 points X 2 with pretensioner and load limitern- Rear seat seatbelt - ELR 3 points X 3n- ISOFIXn- Intelligent Keyn- Immobilizern- VSS Alarmn- Rear view cameran- Rear Parking Sensorn- Zone body structuren- Side impact door beamn- Crashable steering columnn- Automatic fuel valve cut (When rollover)",
                "Features": "- Interlock front grille in an intense black color, decorated with red & orange Nissan emblem, Quad-eye LED headlamps, and the Daytime Running Light.n- New 2.3-liter twin-turbo diesel engine of 190 horsepower and the 7-speed automatic transmission. Powerful, quiet, and fuel-saving.n- INTELLIGENT FORWARD COLLISION WARNING (IFCW), INTELLIGENT EMERGENCY BRAKING (IEB), INTELLIGENT DRIVER ALERTNESS (IDA), and 7 SRS airbags.n- INTELLIGENT BLIND SPOT INTERVENTION (IBSI), INTELLIGENT LANE INTERVENTION (ILI), and HIGH BEAM ASSIST (HBA).n- Black sporty interior with the red-threaded Quole Modure seats and the power driver seat adjustable in 8 directions.n- Interlock front grille in an intense black color, decorated with red & orange Nissan emblem, Quad-eye LED headlamps, and the Daytime Running Light.n- New Black alloy wheels with the off-road All-terrain tires and fender flares.n- INTELLIGENT AROUND VIEW MONITOR (IAVM) with 4x4 OFF-ROAD MODE.n- INTELLIGENT BLIND SPOT INTERVENTION (IBSI), INTELLIGENT LANE INTERVENTION (ILI), and HIGH BEAM ASSIST (HBA).n- Black sporty interior with the Quole Modure embroidered with PRO-4X emblem seats and the power driver seat adjustable in 8 directions.nn"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "NAVARA CALIBRE",
            "Year": 2024,
            "Price": "฿765,000-฿934,000",
            "Style": {
                "Color": "7 colorngrey (stealth grey) ,nred (burning red) ,nblack (black star) , nwhite (white pearl) , ncopper (forged copper),ngrey (twilight grey) ,nsilver (brilliant silver)",
                "Body Type": "Pickup",
                "Segment": "versatile",
                "Door": "2,4",
                "Seat": "2,4"
            },
            "Performance": {
                "Gear": "manual",
                "Powered by": "gasoline",
                "Fuel type": "Diesel",
                "Fuel tank capacity, liters": 80,
                "Consumption rate": "15.23 kilometers/liter",
                "Cylinder volume, cc": 2300,
                "Horsepower": 163
            },
            "Feature": {
                "Safety System": "- ABS with EBD and BAn- Dual front airbagn- Active Brake Limited Slip (ABLS)n- Vehicle Dynamic Control (VDC)n- Traction Control System (TCS)n- Trailer Stability Assist (TSA)n- Rear defoggern- High mount stop lamp (LED Type)n- Adjustable Front seat belt: ELR 3 points X 2 with pretensioner and load limitern- Intelligent Keyn- Immobilizern- VSS Alarmn- Rear view cameran- Rear Parking Sensorn- Zone body structuren- Side impact door beamn- Crashable steering columnn- Automatic fuel valve cut (When rollover)nn",
                "Features": "- Interlock front grille with Quad-eye LED headlamps and the Daytime Running Lightn- New 2.3-liter VGS turbo diesel engine of 163 horsepower. Powerful and fuel-savingn- INTELLIGENT AROUND VIEW MONITOR (IAVM) with the MOVING OBJECT DETECTION (MOD) systemn- 8" Touch screen radio display with the NissanConnect technology for smartphones connectionn- VEHICLE DYNAMIC CONTROL (VDC), TRACTION CONTROL SYSTEM (TCS), and the HILL START ASSIST (HSA) systemn- Tri-zone climate control A/C system, including the back passenger's zonen- Exclusive black accessories: 18" Black Alloy wheels with the full-car Black Edition graphic pattern to enhance the fierceness like no othern- New 2.3-liter twin-turbo diesel engine of 190 horsepower with the 7-speed automatic transmission. Powerful, quiet, and fuel-saving.nFront and side acoustic glass for a quiet cabinn- INTELLIGENT FORWARD COLLISION WARNING (IFCW), n- INTELLIGENT EMERGENCY BRAKING (IEB), and INTELLIGENT DRIVER ALERTNESS (IDA) systemn- INTELLIGENT BLIND SPOT INTERVENTION (IBSI), INTELLIGENT LANE INTERVENTION (ILI), and HIGH BEAM ASSIST (HBA)n- Quole Modure leather seats with 8-direction adjustable power driver seatn- 18" Two-tone Alloy wheels"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "NAVARA KING CAB",
            "Year": 2024,
            "Price": "฿649,000-฿689,000",
            "Style": {
                "Color": "5 color nblack (black star) , ncopper (forged copper) , nsilver (brilliant silver) , nwhite (white solid) , nwhite (white pearl) ,",
                "Body Type": "Pickup",
                "Segment": "versatile",
                "Door": 2,
                "Seat": 2
            },
            "Performance": {
                "Gear": "manual",
                "Powered by": "gasoline",
                "Fuel type": "Diesel",
                "Fuel tank capacity, liters": 80,
                "Consumption rate": "14.56 kilometers/liter",
                "Cylinder volume, cc": 2500,
                "Horsepower": 163
            },
            "Feature": {
                "Safety System": "- ABS with EBD and BAn- Dual Front airbagn- Laminated Glassn- Rear defoggern- High mount stop lamp (LED Type)n- Adjustable Front seat belt: ELR 3 points X 2 with pretensioner and load limitern- Intelligent Keyn- Immobilizer with VSS alarmn- Rear view cameran- Zone body structuren- Side impact door beamn- Crashable steering columnn- Automatic fuel valve cut (When rollover)",
                "Features": "- 2.5-liter diesel engine with a maximum power of 163 horsepower (HPs) and maximum torque of 403 Newton-meters (Nm)n- 205 mm. ground clearance with high-floor grade fender flaresn- Black interlock front grille with the tailgate spoiler for a touch of sportinessn- 7-inch touch screen with NissanConnect that supports smartphone connectivityn- New interior design with a sporty steering wheel, newly designed seats, and back area A/Cn- Remote control key with the central lock and auto door lock systemsn- 215 mm. ground clearance with 17" alloy wheels and high-floor grade fender flaresn- Chromium interlock front grille with the automatically adjustable and foldable body-colored side mirrorsn- 8-inch touch screen with NissanConnect that supports smartphone connectivityn- New interior design with a 3D color display and a sporty steering wheel installed with audio control buttons and cruise control systemn- Push Start, intelligent key and auto halogen headlamps"
            }
        },
        {
            "Brand": "Nissan",
            "Model": "NAVARA SINGLE CAB",
            "Year": 2024,
            "Price": "฿595,000-฿659,000",
            "Style": {
                "Color": "3 colornwhite (white solid) ,nsliver (brillaint sliver) ,ngrey (twilight grey),n",
                "Body Type": "Pickup",
                "Segment": "versatile",
                "Door": 2,
                "Seat": 2
            },
            "Performance": {
                "Gear": "manual",
                "Powered by": "gasoline",
                "Fuel type": "Diesel",
                "Fuel tank capacity, liters": 80,
                "Consumption rate": "14.56 kilometers/liter",
                "Cylinder volume, cc": 2500,
                "Horsepower": 163
            },
            "Feature": {
                "Safety System": "- ABS with EBD and BAn- Dual Front airbagn- Laminated Glassn- Rear defoggern- High mount stop lamp (LED Type)n- Adjustable Front seat belt: ELR 3 points X 2 with pretensioner and load limitern- Intelligent Keyn- Immobilizer with VSS alarmn- Rear view cameran- Zone body structuren- Side impact door beamn- Crashable steering columnn- Automatic fuel valve cut (When rollover)",
                "Features": "- 2.5-liter diesel engine with a maximum power of 163 horsepower (HPs) and 403 Newton-meters (Nm) of torque.n- Mono-Frame Chassis made from one single steel structure.n- Side step for easier access to your truck bed.n- Designed to carry cargo and lots of it; capable to fit 14 baskets or 14 boxes per layer and up to 40 pieces when carrying 3 layers with a total weight of 1,090 kg. Note: Box with dimension 35 cm x 50 cm x 32 cm. Baskets with dimension 37.2 cm x 57 cm x 30.3 cm.n- 7-inch touch screen with NissanConnect that supports smartphone connectivity.n- Speed sensing auto door lock.n- Choose full-time 2WD for maximum efficiency or shift to 4WD at speeds up to 100 km/h. Select low range 4WD (4LO) for mud, sandy, or difficult terrain.nnnnnn"
            }
        }
    ]
}

When I run my code it doesn’t work. I tried deleting the data to just two cars, it doesn’t work. But when I delete the very long data on the line, it works. And when I try to add the other cars back without the long data on the line, it doesn’t work. If anyone can answer my question, thank you very much. I’m not very good at coding and am just learning. Thank you so much for reading this question, and thank you very much if you answer!