i am always baffled when it says you may have to create a library sub folder when you add to the library ,if there is already a library subfolder there with all the examples why would you need to create another library folder .?? i just add to the existing library folder is this right or wrong ? i can do this with arduino IDE but not the MPIDE , adding to the MPIDE library seems fraught with problems and i cant get it working
as in this from adafruit download page .
Place the Adafruit_RGBLCDShield library folder your /libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the IDE.