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Hi All, I am trying to run an analysis on a pipe section subjected to torsion. When I run the analysis I get the below message ***There were 4 error messages during input processing*** The first message is repeated below: *** ERROR # 772 *** It is invalid to use a free grid as an independent grid in RBE3 data. Free spiders are not allowed to be independent grids in RBE3 data. RBE3 id = 4903 free grid id = 9634 weighted components = 123 You should remove this grid from the RBE3 data. *** Run terminated because of error(s) in the input data. Does anyone have any advice to resolve this error? Thanks in advance, Luke