When running a mechanical study with input temperatures from a thermal study, I copy the mesh created in the thermal study and paste it in the mechanical study mesh. In that way, there is insurance that the calculated temperatures are reported in the mechanical study. Otherwise, when running two meshes, if the meshes are different, there is a risk that the nodes do not correspond, and that the input temperatures are not defined in the mechanical study. This should be the cause of that error message.
In the same idea, if there is a need to add a controlled mesh in the mechanical study, the thermal study must be re-run to take the same controlled mesh, then only the mesh should be copied in the mechanical study to be run.
Hope this helps.
Thanks for taking the time to respond. As I mentioned in my original post, copying the mesh works fine, but after 2009 that should no longer be necessary. My static sim uses contact sets (e.g. no-penetration contacts) which are not available in the thermal sim, which is why I asked the question in the first place.
After calling tech support, the answer was found: I was running 2010 SP2.1, and when I updated it to 2010 SP5.0, the error message went away, and it ran without a problem. Voila!
The said solution ran correctly in your specific case. But I have now 2012 SP1.0 and sometimes I get the same problem, somtimes not. This is a typical example of what I call 'erratic mistakes' in SW sim.