Plugin Help Problem with GAListener

On my server, I use a plugin called GAListener with Votifier. I have recently setup the /rewards command, and was working perfectly fine until we added cumulative rewards. Every time a player uses the /rewards command, it says "an internal error occurred while attempting to perform this command." When I added cumulative rewards, the whole rewards section of the config was removed.

Pictures:

http://prntscr.com/6b83jy

As you can see, I was able to put the specified rewards back, but the internal error message is still there.

Also, here is my GAListener config:
http://pastebin.com/Ndr7W1uQ