For the error, I suspect you ran a post solve for a command snippet under the Solution branch after a solution was present. If the solution is cleared, it will run the command snippet as part of the solution and this error does not occur. To run as a post solve, you often need to set "Save MAPDL db" to yes in the Analysis Settings:
In the command snippet include the RESUME command near the top.
You are navigating away from the AIS Discovery experience
