ERROR Locking Temporary Folder

Using Mac OS X El Capitan 10.11.6. Audacity 2.3.3
Have been recording a new project with multiple stereo tracks & now am getting the warning pop up “Error Locking temporary Folder” & asks if I still want to start Audacity. Happens each time I open Audacity after shut down. I had recently deleted another version of the project. NO idea what that’s about.
Also get an error opening sound device notice many times as well. This one requires effort to get a mic/input signal to the input meter from the recording device. (there’s another thread about this one also - which doesn’t arrive at a solution. I’m using a Metric Halo UNL-2 3d. but I suspect the interface is not the issue.
Any help is appreciated. Thanks.

See if this post helps:

Thank you Steve. That did it. Much appreciated.