AccessViolationException during Assimp Export

I'm trying to export a plane drawn into a Model3DGroup using AssimpWpfExporter class.
I did some test using the Assimp exporter sample and everithing worked fine when I saved the same  OBJ file into the Application Debug/Release folder. 

Then I moved to another project and I wanted to save the file into a different Path: the current user Documents folder. 

Unfortunately, sometimes, an unhandled exception break the execution of the application, as you can see from the attached picture.

Why is this happening?
Thank you.

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AccessViolationException during Assimp Export - by - 07-11-2018, 03:17 PM

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