Same problem. May have a fix. Its exporting. I’ve got a timeline of MXF files, pngs, .movs and some other stuff. Premiere hates it. Plays fine, just won’t render or export. Tried pro res, h264, match seq settings, blah blah blah…
Exporting as MPEG2. MXF seems to like Mpeg 2. The only other thing I can think of is a horrible solution which is to bring all your clips through XDCam transfer or something similar to cover them to .mov. Something like that.
Anyway…try this.. Unknown error isn’t very helpful, cheers Adobe. Good luck