Topic: error 32

Every time I try to save a new project in a folder, it keeps giving me this message:

Error 32
No access. The folder path could not be used.
Try saving the project to a different folder, or to the Desktop.

I was able to save it in other folders before and not on the Desktop. I don't understand why it is different this time.

After I saved it on the desktop, moved into my folder, and then try to open it, it tells me:

This is not a valid project folder.

I am on a Mac and using the latest version 1.9.5. Please advice!

Thank you.