File not Copied message on upload when the file is actually copied

I have an issue running drupal 5.1 and the audio module on two separate site on two different servers.

When I upload and audio file, after the upload completes and it takes me to the post, I get this error message:
"The selected file could not be copied, because no file by that name exists. Please check that you supplied the correct filename."

If I hit "Preview" when I an going to upload the file, goes through that screen fine, shows the file path in the /tmp/audio directory like everything is fine, then when I hit "Submit", it completes the upload and gives me the error.

So to be clear, it give the error in both "workflows" if you want to call them that.

But everything works. The file plays, it's on the server where it's supposed to be.

The audio file plays fine, just the error that's misleading.