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You also need to use the correct package for the robot. So for you the source should be placed in a folder called "pac" (in the robots directory) and "package pac;" should be at the top of your ABC.java. Then when you package the robot and robocode asks where to save the file you should use the file name robocode provides. This is important, as the file name must match the name of the robot and package.

I hope this helps.