WARNING: Category '' in library EEPROM is not valid. Setting to 'Uncategorized'

Using Arduino IDE 1.x
5

notes:

  • reinstalling the IDE didn't help because the board packages are in a special folder (C:\Users\user\AppData\Local\Arduino15 on Windows and ~/.arduino15 on Linux)
  • the 1.6.23 has problems with compiler. if you get "Segmentation fault", the downgrade to 1.6.21
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