Hello. I am working with a model of a skid and I want to simulate its contact with its foundation. I want to use a virtual wall. I have created a plane along the same plane as the base of the skid. My base is all shell components. I have created the contact between the shells and the plane. When I run the simulation, I get this error; "Initial Interference not allowed for virtual wall." I do not understand why I have an interference. I have taken the offset of the shells into account. Any thoughts??