On starting the elastic analysis, you get the error:

lambdaU not found for standard NotSpecified and material 7f8a234f-eee3-49a1-98e9-1fb7afdd29c4 in section 3ba0fdb0-197a-4864-ac3b-60e18aadc610

at Buildsoft.TSection.GetValue(Standards standard, Guid materialID, String prop, Boolean useDefault, Boolean useParent)
at Buildsoft.TSection.GetlambdaU(Standards standard, Guid materialID)
at StructureHelper.TStructureHelper.AddLineOnMeshProperties(@MetaTStructureHelper Self, TStructure struct, TCompleteLineOnMesh CompleteLineOnMesh, Boolean WithCreep, Boolean WithTimberCreep, Hashtable standardList, Int32 CalculationType)

Solution

• Verify the section properties of all bars. For some cross section the parameters λ_u and λ_v will be missing.
  The parameters λ_u and λ_v are used to determine the shear deformation.