Could we arrange a time when you're free to use something like Teamviewer and Teamspeak (or Skype) to fix this plugin because I just changed to side view characters and it worked...I want to help you however it's a little difficult with my version just working.
This:
$gameParty.gainItem($dataItems[$gameVariables.value(1)], 1);
Did this ever work? I see why now you're doing it in this way...hmm. Its so you don't have to program much in the event system.