Hello again, @KenCanToo.
Thank you for attempting the steps I suggested and clarifying further. Have you had a chance to also look over the articles @LilyC mentioned? It sounds as though you are encountering data damage within the file because multiple users are running into the same message.
From the articles, I recommend running a rebuild and a verify on your data. This will check for, fix, and diagnose any issues within the file. Give these steps a try and come back to the Community if you're still seeing the same error message. I'll be on standby, waiting for your response.