Game crashing when loading quest data. Quest data location?

I'm sorry if this is not the proper way to proceed with this, I'm not sure if this is a bug so I didnt file it as a bug report and it seems like if I could just delete my quest and start over it would work but I don't know where to find it. I'm playing on PC and have the most recent version of Forge. If anyone could tell me the default location for the quest data I would be very grateful. I look forward to using your wonderful program again! Thank you in advance.