If you are using Eclipse, on top menu bar, click "search": "file": In "text" placeholder, put "you can't use" and in "file" placeholder, put "*.java"
If you are not using eclipse, go to CombatAssistant.java and search for: "you can't use".
If you want, you can place your "combat assistant" class here in a "code" format or upload it to: Pastebin.com - #1 paste tool since 2002!