Again, this is your firmware telling you that your hotend couldn't hold heat properly, which can be caused either by a mechanical issue (e.g. the thermistor and heating element are not seated properly anymore) or a firmware bug. You will not solve that by anything that you do to OctoPrint or the Pi it is running on, you need to solve this on the printer. Make sure that the printer's power supply is on, make sure that the thermistor and heating cartridge are seated properly in the hotend, check all of your wiring.
there are 3 folders 1 file I don't know which one I should use
https://drive.google.com/drive/folders/1hQC8uByYPjwJlsrf8ZDvagHKZDphOjhp
I do not know how to upgrade the firmware on your particular printer and thus cannot comment on any tutorials for doing just that, and I also cannot promise you that a firmware update will fix the heater error because it might just as well be an actual physical problem on your printer which you need to fix. As I said, check the wiring, the seating of the thermistor and cartridge, make sure the printer's power supply is actually turned on and so on. If push comes to shove, seek advice in a forum or group dedicated to your specific printer.
All I can tell you is: This error is generated by your firmware, a sign that something might be really bloody wrong and you need to fix that regardless of whether you run OctoPrint or not since OctoPrint has nothing to do with this error.
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thanks so much for the effort to solve this