iCal is freezing up - have tried everything - Help!

My iCal has been freezing up on my Mac for the past week. The functionality on my iPhone works fine though. I ran Console while starting iCal and here is the script I found: 8/27/12 3:55:41.410 PM iCal: Duplicate UID: u9u5o2tabp84aomgneppgl10ao@google.

I have already used a Duplicate Event Remover for iCal and ensured that none of my unused calendars are active. Still no luck. Any help would be greatly appreciated.