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Actually, I converted my Abaqus file to OptiStruct, and when I run my analysis, I encounter errors with the material properties. They seem to have mixed up. I've tried modifying several parameters, but without any success
Hello,
How did you convert the model?
I would recommend you use the Convert Tool
From the File menu > Convert.
https://help.altair.com/hwdesktop/hwx/topics/conversion_between_solvers/convert_abaqus_to_optistruct_mapping.htm
The error messages you seen means you don't have a property PID assigned to those elements.