This may help. I often use a firestore firewire recording system along with a tape in the camera. However, when I use the camera start/stop button and the firestore is already recording, it will cause a 1 frame glitch in the firestore's video. If I don't edit this 1 frame out, FCP will post the error you are getting upon output. (If the frame does not need rendered and you select "reference movie" it will export. However, then when you transcode in Compressor, it will fail with a general error that is not very helpful.)
So, all this to say, see if you have any funky frames and edit them out, then try the export again.
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