I have been trying to simulate a FSSW process but I keep getting the error given below. Likewise, I have applied the needed BC to effect the changes it suggested but all to no avail. Please, I would be extremely glad if I could get a helping hand. 

"The deformable element nodes contained in node set ErrNodeRotNodeNoRotInert have no rotary inertia associated with them and some rotational degrees of freedom at the nodes are not constrained. Either rotary inertia must be defined or all of the rotational degrees of freedom must be constrained"

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