• Concentrated loads or constraints—This includes point loads or constraints applied to plate, shell, or solid elements, and line loads or constraints applied to solid elements. Use distributed loads or the total load at point instead, or use the Isolate for Exclusion AutoGEM Control to isolate concentrated loads or constraints.

• Improperly applied moments—Errors are sometimes caused by moment application with the axis of twist aligned—or nearly aligned—with the surface normal of a plate or shell element. Apply the moment using the total load at point.

• Prestress load is too high or exceeds the buckling load—Decrease the prestress load and rerun the model.