Mix Export Problem in Nuendo 3

I am running into a problem trying to export a output mix track in Nuendo 3.2.1 I have all the markers set, and a valid file type, but all I get is an error that says “error occurred during the export”. I have not run into this before, and can’t figure out what the “error” is. It is only a mono 48 kHz track, about 15 minutes in length.

Any thoughts are appreciated.

Locators the wrong way round?

DG

Export settings?
File type, bit rates/depths etc, B-WAV tags?