Can't Return to Analytical Model (Staad Physical Modeler)

Hi,

I try to create ISM repository from sample revit files.

Then I create model to staad physical model tru that ism files.

At the view tab I do not received any error if I wanna view my analytical model, but at the time I will return now model to staad for analysis it give me error and it will end up I cannot proceed transferring the file.

Any Idea what is the problem?

Thanks

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