Unable to générateur AAF file in X2Pro from FCPXML

Can you please try adding your system drive (Macintosh HD) to the Media locations in X2Pro's preferences, then try converting the project again.

When I try to générate an AAF file for opening in Nuendo for the final mix, I get the following alert. The FCPx timeline consiste of iPhone 6S Plus clips is 4K with 44.1 KHz audio

Writing AAF file
Adding assets to AAF file
Adding essence for asset [Thierry in lane scratches] to AAF file
Opening audio extractor for portion 0 of asset [Thierry in lane scratches]
Failed to open bookmark for asset [Thierry in lane scratches]

Suggestion : ensure that the location for this file has been added to the Media Locations in the Preferences

No AAF file has been generated.
X2Pro Audio Convert 4.0.17