Hi @petersing,
this error typically happens if a plate is constrained on both sides AND the top face with contacts. I agree that the error message isn’t incredibly helpful in this case and should be improved. For the time being: Running an Imprint operation before you simulate the model helps here, as it only “bonds” the parts of 2 plates that really touch to each other.
If you do that, the sim runs exactly like set up (note that I generated a coarser 1st order mesh for demo purposes): https://www.simscale.com/workbench/?pid=7841772870250103363&rru=d453c00c-f0e4-4b76-bf55-a7f832653815&ci=b0e428e2-d9c2-4c78-b01d-9090975c8598&ct=SOLUTION_FIELD&mt=SIMULATION_RESULT
