Issues with AAF export

Can you please attach your fcpxml.
Are you able to play the "OPENING" clip in QuickTime Player?

Hi there,
We are having problems exporting AAF

files.
These are the errors we are getting.
1.
An error occurred converting Final Cut XML to AAF
Writing AAF file
Adding assets to AAF file
Adding essence for asset [OPENING] to AAF file
Adding essence data to AAF file for portion 0 of asset [OPENING]
Reading audio data from audio extractor : 130559 samples
Failed to read 130559 samples
Error Extracting audio data (read 0 bytes of 261118 required) (The operation could not be completed)

Suggestion: Does this movie contain an unsupported audio format ?

No AAF file has been generated.
X2Pro Audio Convert 3.0.5


Please can you help, this is very urgent as we need to complete this program asap.
Thank you
Paul