Immediately after finishing an FEA, I get an error: 

"Unable to create the plot due to:

1) The requested quantity cannot be found in the result file...

2) Post data is invalid..." (transcribed for future googlers)

Then when I try to open a stress plot I get a similar error:

This has happened a few times before but went away after rerunning the analysis. But this latest time, I have run the analysis 3 times and still get the same results...

It is a static/structural FEA and I am running 2020 sp 2.0. I have not done anything after running the FEA, and when I look in the results folder, the .cwr file looks correct.

Any suggestions?