I can't upload my Arduino project

Symptom(s)

When you try to update an Arduino board, an error message may appear in the file platformio.ini.

Possible explanation

This error is related to an upload problem of Arduino, even though you do not have any compilation errors.

Resolution

You need to restart your Arduino board so that it is ready to be flashed. Double-push your Arduino's reset button so that it gets in boot mode, and try to relaunch the upload of your firmware.