Setting ASPathName Error

I am intercepting the open dialogs return value for inserting documents where it tries to set

ASPathName** outASPathNames

and setting it myself like so

     char *filePath = "/C/test.jpg";

     ASPathName asPathName = ASFileSysCreatePathFromDIPath(fileSys, filePath, NULL)

     ASFile asFile;

     ASFileSysOpenFile(fileSys, asPathName, ASFILE_READ, (ASFile *)&asFile);

      *outASPathNames = &asPathName;

It appears to be a correct ASPathName as I can use it to open documents fine using the below code, yet as a return value for the dialog it does not work.

AVDoc doc = AVDocOpenFromASFileWithParams(asFile, 0, 0);

When the dialog method returns I see the following error message on my screen

I have no idea where to go from here, can anyone shed any light on this?