it doesn't work. Why not?
If I knew why I get "error compling movie. Unknown error" then I wouldn't be posting on the forum.
As I looked at the list of possible reasons, the 2nd one jumped out at me as I was exporting to the same name. Unfortunatley that wasn't the problem. Checking the other ones:
Disk has plenty of space.and none of the other things are problems as I can export things without matching settings.
As in the test, there was no other clip or modifications that is not the problem. I tried several other clips from the D300s and the results are always the same. There is no ability of the program to match the sequence settings. Checking this box is why it won't work.
The last suggestion is to post the problem to the user forum so here it is in a perhaps endless loop with no solution other than PP just can't do it.
If I knew why
What I'm saying is, we don't know either. There is not a definitive cause for the unknown error message that we can say to you, "do this and it'll work".