Help with saving project error

I cannot save my project files any more. This is the message I get:

“Could not save project xx.
Scrivener does not allow saving to a project’s .scriv folder.
Please select another location.”

No matter which location I select, including a blank USB stick, I get that message. I want to move my project to my laptop as my PC (where it is at the moment) can’t access the internet. Please help!