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Error: Check OptiStruct input file

Hi!

I received the following error message in SimLab when I tried to solve a Normal Mode problem with the solver OptiStruct:

Error: Check OptiStruct input file.

 

I have followed a tutorial, so I do not think there is something wrong with the boundary conditions, and when I tried the same thing a few days ago it did work. (I have tried different set ups as well, but receives the same error message).

Do you know what could be wrong/what can I do to search for the problem?

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