An error occurred converting Final Cut XML to AAF

I have emailed you directly

Hi Graeme - here are the error details as you requested:

An error occurred converting Final Cut XML to AAF

Writing AAF file
Adding assets to AAF file
Adding essence for asset [ZOOM0024_Tr3] to AAF file
Adding essence data to AAF file for portion 0 of asset [ZOOM0024_Tr3]
Reading audio data from audio extractor : 1398101 samples
Failed to read 1398101 samples


No AAF file has been generated.
X2Pro Audio Convert 3.0.2

FCP X version 10.2.2
OS X 10.10.5

I have tried both selecting and not selecting "Trim handles", and tried handles of 10 sec (that's what I'd prefer), as well as 8 sec and 2 sec durations - it still fails every time, but with a different file name depending upon whether I selected longer or shorter handles. I tried it on two separate machines (both identical OS and FCP X versions, though), and it fails the same way on both machines.

I'm up against a deadline, so please reply asap! Thanks so much!

Jade