If when saving a ProSelect album file (.psa)  you receive an error message and code, then the most common causes are:

• The file (or folder) has been renamed while the album file (.psa) was still open in ProSelect. You could try renaming the file or folder back.
• The file is being opened/saved on a flash/thumb drive. We always recommend copying the file to your hard drive first then opening it in ProSelect.
• The computer going to sleep before closing the album (loses connection with the album file)
• The file was opened over a network, and the network connection was lost.
• Opening the file directly from a Dropbox folder or similar.
• If you are using ProSelect 2022r1.7 or later, see this article Recovering from Album File Save Errors.

You will find a list in this ProSelect General Error Codes article.

.Other related articles are:

Error E20200 and C0120 when saving album file
Album Save Error Recovery
"This file is not an album" when Saving
Using Dropbox - beware!