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How to fix exception error _tkinter.TclError: expected floating-point number but got “

I’ve had a few troubles with an App I’m making in order to read values received from an ESP32 chip. I can correctly connect to it and receive the data as well as save it into .csv format, one for each day, in the folder I want. The problem comes when I change tab inside that app to one that display 3 graphs for each type of values for the last 4H, I get the following error: