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Solving Topology Optimization

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While solving a topology optimization file, I get the following error mesage:

 A fatal error has been detected during input processing:

  *** See next message about line 409 from file:
      D:/Optimization - Weight Reduction/Final/101/s101-5.fem
   "SURF           3ELFACE"
  Syntax error(s) found in bulk data 'SURF' card.


Unable to understand what does it say?

How to resolve this?

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If you have any contact surface in the model, can you recreate it?.

If still problems persist, please share the model to the drop box.

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