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I am not sure how you are setting up this study, but try running it using the direct sparse solver.
You could try making a new study and copying all your restraints and loads from the original study to the new one (will only take a few minutes to do).
I got this error and found that for some reason the model I was analysing had 18-off bodies listed but there should only have been 8-off. Bodies had been duplicated which I assume screwed up the meshing and analysis.
By making a new study with the same model, the number of bodies in the new study reverted to 8-off and the analysis ran fine.
Hope it helps.
You can get this error if you dnot define contact between the rings. Please define a contact set and try again.
Thanks for giving me suggestion.Actually there is a fault by me. i forget to give a contact between the rings. that's why the error generates.