*** ERROR # 583 ***

Are you running OptiStruct Analysis or Optimization?If Optimization,then please make sure to have design objective.

Also please let us know the version of OptiStruct you are using at your end?If possible share .out file.

Hello Rahul R, 

thanks for your answer, the problem is design objective.

Now another problem born shown in the image, but there is no objective folder.

Where am I doing wrong?

Thank you

<?xml version="1.0" encoding="UTF-8"?>

<?xml version="1.0" encoding="UTF-8"?>

Have you already defined Volume as Design constraint? If so, then it should not work. I see you have only one optimization response.