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Error 902 CWELD

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I try to connect two meshes with connectors to simulate a weld. I have spot connectors with type rod. Then I defined a new property with PWELD and steel as material and assigned it to the connectors component. It is to connect two steel beams.


When I now want to run OptiStruct, I get Error 902:

 *** ERROR # 902 ***
 Weld uses an ALIGN connection type and
 GA (or GB)
 is not a vertex grid of a shell element.
 CWELD element id = 313472.
 GRID id = 63648.


Can someone help me?

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