hello im making my own operating system and im trying to compile it with nasm but theres is some error and ive checked the code and i think iv’e typed it right

here is my assembly code:
org 0x7C00
bits 16

%define ENDL 0x10, 0x0A

start:
jmp main

;
;prints a string to the screen
;params:
; -ds:si points to string
puts:
;save registers we will modify
push si
push ax

.loop:
lodsb ;loads next character in al
or al, al ;verify if next character is null?
if .done

mov ah, 0x0e
mov bh,0
int 0x10
jmp .loop

.done:
pop ax
pop si

main:

;setup data segments
mov ax, 0          ;can't write to ds/es directly
mov ds, ax
mov es, ax

;setup stack
mov ss, ax
mov sp, 0x7C00     ;stack grows downwards from where we are loaded in memory



;print message
mov si, msg_hello
call puts

hlt

.halt:
jmp .halt

msg_hello: db “hello world!”, ENDL, 0

times 510-($-$$) db 0
dw 0AA55h

the error i get from the nasm console is:
boot.asm:23: error: parser: instruction expected