node numbering error

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node numbering error

saidhoss2001
Dear friends, I am trying to model delamination using zero thickness cohesive elements. In some cases, the model seems to be working good but in some others, I get the error "The node numbering might not be correct for element xx instance x". I checked the stack direction and node numbering in working and models with error but I found no difference. Does anyone have an idea on how to solve the problem?