Think you might have already sorted out this issue by now, but I was struggling with the same error code (26::311) this morning and after a lot of searching on-line to no avail, I tried a few things. What seemed to clear up this issue for me was I had more than one audio track in my project, so I turned the audio off that was linked to some clips I am using and this has seemed to fix the issue.
Hope this helps someone else out and saves them the hour that I just spent trying to fix this issue.