I have built a model under linear natural frequency analysis but now have to convert it to a nonlinear natural frequency analysis because I need to use shell elements to provide out-of-plane bending. However, after I change the analysis type and re-specify the element types and element properties, I get an error during the "Start to make nodal condition tables . . ." that "Error: unknwon element type 0 in nonlinear analysis".
Does anyone know what might be causing this? What is element type 0? I have tried disabling elements to try to track down the "culprit" but none of them seem to be the cause (I'm just using shells, beams, and springs). I really don't want to have to redraw my model because it is quite large and took a long time to initially develop.
I guess the error means that some of elements have no appropriate element types. You need to double check your part setting and "check model" again.
If this response answers your concern, please mark it as "solved".