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

Development Tools IDE 1.x
1

Hi people. I'm Arduino programmer in Finland. Have been programming Arduino last time in 2015. Now opened the sketch(es) again and found mysterious warnings.
Even compiling the "basic" sketch:

void setup() {
// put your setup code here, to run once:

}

void loop() {
// put your main code here, to run repeatedly:

}

I get this warning:

WARNING: Category '' in library EEPROM is not valid. Setting to 'Uncategorized'
WARNING: Category '' in library SPI is not valid. Setting to 'Uncategorized'
WARNING: Category '' in library SoftwareSerial is not valid. Setting to 'Uncategorized'
WARNING: Category '' in library Wire is not valid. Setting to 'Uncategorized'
Warning: platform.txt from core 'Arduino AVR Boards' contains deprecated recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{build.path}/{archive_file}" "{object_file}", automatically converted to recipe.ar.pattern="{compiler.path}{compiler.ar.cmd}" {compiler.ar.flags} {compiler.ar.extra_flags} "{archive_file_path}" "{object_file}". Consider upgrading this core.
Sketch uses 450 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.

Have uninstalled Java and Arduino IDE, then reinstalled IDE 1.8.7. -- No effect.

My PC is 64 bit HP & Win 8.1. The funny thing is that if I use my 64 bit Thinkpad laptop and IDE1.8.7 there are no warnings.
I know that these lines are "warnings" but it would be nice not to see them. Any ideas how to make a "clean" installation of IDE and Java?

2

This indicates you're using an extremely outdated version of Arduino AVR Boards. You can update by doing this:

  • Tools > Board > Boards Manager
  • Wait for the downloads to finish.
  • Click on "Arduino AVR Boards".
  • Click "Update".
  • Wait for the update to finish.
  • Click "Close".
1 Like
3

Many thanks! That helped. Now the "Arduino AVR Boards" is version 1.6.23. Also checked my Thinkpad and there this most recent version was already installed.

4

You're welcome. I'm glad that solved the problem. Welcome back to the world of Arduino!
Per

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
1 Like