Hello.I am running a simulation on the stress distribution over the airship envelope and try to analysisthe effect of adding more cable on the envelope body to decreas the overall stress. I am having a problem with interaction definition of cable and envelope. the element tuype of envelpo is shell element S4R and I considered cable a sthe truss and the elemnet type is 3D truss element T3D2. the interaction metods that i considered is sufrace-surface and the contact property is ---> tangential behavior-->rough and also I put Geometric properties. I encontered with these warning which shot an error:

((((For two-dimensional models, if a non-unity thickness is specified for two-dimensional solid elements and these elements are involved in an interaction such as contact, the same thickness should be specified for the out-of-plane thickness of the corresponding surface under *surface interaction.)))))