Looks like you added an include for CommandBase.h to your WPILib.h file on line 14
Line 14 is blank for me
http://img.prntscr.com/img?url=http:...om/K6eKywP.png
You shouldn't modify WPILib files in most cases. Remove the line, or reset your wpilib install by closing Eclipse, deleting %userprofile%\wpilib, then starting Eclipse again.