Project Is Corrupt (Unable to work with blockfiles) Error when loading project file Help!

I am unable to open my project file, I saved the project yesterday using latest Audacity version,
I get this error when opening:
“Project Is Corrupt (Unable to work with blockfiles)”
I have been saving and loading other files recently with no problem, I cannot think of anything i did different. Any idea why this is happening?
I had another loading error about a month ago, again I am not doing anything different, I am using same folders. I’m starting to not trust this software, I don’t know if I’m going to be able to re load my projects.
I just tried opening other projects i saved in the last month, same error for them all.

I have been using Audacity for over 10 years, never had this issue.

Are there any decent alternatives to Audacity?
Thank you for your help,
-Eric