Bulid error - 'File' was not declared in this scope

[maxgerhardt]

@harkjael01

build_flags = 
        -I "C:\Users\JJS\.platformio\packages\framework-arduinoespressif32\cores\esp32"
        -I "C:\Users\JJS\.platformio\packages\framework-arduinoespressif32\variants\esp32"
        -I "C:\Users\JJS\.platformio\packages\framework-arduinoespressif32\libraries\FS\src"

This is almost always wrong. Let me double check how this can work.