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ERROR # 1152 attb must be blank free shape

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Hi guys,


I'm trying to run free shape optimization. I already set static stress response and reference to minmax stress. I don't know where is the problem. Below screenshots of my run setup. Could you help me? I will be grateful for some good videos or tutorials with step by step setup creation. I don't even know where I can found ATTB. ( I plan to perform linear static free shape optimization of frame).
Second question: Do i have to implement mesh barriers(bmfaces???)?

Error text:
*** ERROR # 1152 ***
 ATTB must be blank or positive integer for this response type.






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