| E5127 | FATAL ERROR: E5127 | NON-ZERO STRAIN ENERGY REQUIRED FOR DESIGN OPTIMIZATION |
| Cause: | In a topological design optimization solution, non-zero strain energy is required for each user-specified subcase to perform design iterations. This error is usually the result of either not referencing or referencing non-existing LOAD , SPC , or TEMPERATURE sets in the Case Control Section. | |
| Action: | Correct the model loading. | |
| Remarks: | See Autodesk Nastran Solver Reference Manual, Section 3, "Case Control", for command format. |