Free Size optimization

Hello everyone,

 

I am doing a free size optimisation of a composite part for the first time. When i tried to run the model, i get the following error

 

*** ERROR # 6004 ***
 Element 2343640 belongs to SETs 28 and 29, which are used
 in GROUP definition on DSIZE card 1. Each element can only belong
 to one such SET.

 

Could someone please help how to deal with this problem?

 

P.S.: Unfortunately, I could not share the FEM file since the project is confidential.

 

Thank you and looking forward to hear from you.