You can either delete this line
registerVoicedCommandHandler(new menu());
or insert a simple boolean in order to enable/disable it when you wish(like the rest of voicedcommands).
how the hell you are supposed to use vitality effect in interlude since itsn't implemented?
unless you implemented it,but I doubt it since if you would,you would knew what kind of effect you need to use.
NoClassDefFoundError usually is appearing when you edit/change the jar while the server is online.
re-compile,close the gs console,and replace the jar.