If I ever see this error I usually go see if I can find the last backup file PT created .. right away if possible. (File-Open Special-Open Backup)

Revert back to a known good copy and you can continue to work with confidence.
If a file reports an error, I'm not comfortable continuing to move forward.
I'd rather have a safe working copy.

Using Save As can solve some issues (like corrupted drive section or read/write issues) but still makes me nervous sometimes.
Often enough it works just fine though.

Just thought I'd post another possible solution if the issue is caught early on.
Some users don't think about the backup file (or don't know it exists) in the moment.

Make your sound your own!
.. I do not work here, but the benefits are still awesome