Frack.
You just HAD to cancel the quest RIGHT THERE, didn't you.
OK, this is ultimately my fault. I accidently created a place in the chain where, if you cancel the quest, you are unable to take it again. The fix already exists, but it won't show up until 1.2.
I'm afraid you'll need to file a support ticket. When you do, post the ticket number here so I can add specific instructions for the GM to get you back on your way. I apologize for the inconvenience.