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solver error: specified Nastran file does not exist

Builder
Builder

Hi 

I run NX for an assembly (2 parts connected by Surface/Surface glue ) after running the solver and writing the input file. I end with an error that it cannot find the input file dat. See attached, please.

 

It is bizarre that the dat. file not exactly the same name of the model as one letter instead of being capital is a small letter. not sure if this is a problem.

Also, note that the dat file size is 9GB !! which might be is the reason that NX cannot read it!

 Update: when upload/open the sim file, it fails loading it as a problem with o/s see attached please

have any of you run into a similar error, please? any suggestions?