Hello! I've been trying to install moj plugin on a topcoder applet in a new environment. The problem is I'm getting Exception in thread "AWT-EventQueue-2" java.lang.NoSuchMethodError: com.topcoder.client.contestApplet.common.LocalPreferences.removeProperty(Ljava/lang/String;)Ljava/lang/String;... when trying to save preferences of CodeProcessor, at this point:

Pressing the save button doesn't do anything except for raising the exception in the console. Does someone have any information relevant to resolving this issue? Thanks!