Quiz answers submission failing (500 : internal error)

[joseph...@h2itsolutions.com]

I've been debugging this for a week now. Whenever I use the api call to submit quiz answers in JSON format i get back an internal error message. I went through the log file for my local canvas instance and found the error as attached in the file. From what I can tell the function "reduce" is either missing or its just not finding it. I've made sure I had the necessary version of Ruby (1.9.3p484), but that doesn't seem to be the issue, heck I even tried to switch it with inject only to end up with the same error. I'm lost as to what else to try. And this is the only functionality that's failed me. If anyone can point me in the right direction I'd greatly appreciate it.