Correct error message when permission check fails.

lib.js

@@ -206,6 +206,7 @@ class _Client extends Client
                     }
                     let command = this.commands.get(commandName).command
                     if((needsAdmin && isAdmin) || !needsAdmin) return   new command(this).run(message, args);
+                    if(needsAdmin && !isAdmin) return new ErrorMessage(this).send(ErrorType.Permissions, message);
                 }
                 new ErrorMessage(this).send(ErrorType.NotOnTheList,message)
             }