Same error for me as well. But mine is weird. I started the "Bolt modeling and preload" course. The workshop model was used and DP0 in parameter set solution was successful. But when the DP1 was updated according to the Workshop video. I am having the above error. After this I

can't even run the DP0 again, I get the same error for DP0 and DP1.

Ansys 2023 R1.

Can anyone help me solve this? Your help is much appreciated.