Did you check the DVD? There have been instances where an export was successful, despite error messages.
If feasible, share your work...
With your project on the time time line, click FILE|SAVE PORTABLE PROJECT. Upload every file that results to DropBox, Google Drive, MS OneDrive or the like.
Make the link public and post it here. Someone will check things out. If there are many files, zip them first, then upload the ZIP file.