| E5058 | FATAL ERROR: E5058 | NON-ZERO GLOBAL MASS MATRIX REQUIRED FOR ANALYSIS |
| Cause: | In MODAL solutions, a non-zero global mass matrix is required to extract eigenvalues (natural frequencies) and eigenvectors (mode shapes). This is usually the result of not specifying material density. | |
| Action: | Correct the applicable material Bulk Data entry (MAT1, MAT2, MAT8, or MAT9) by specifying material density in consistent units. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 4, Bulk Data, for entry format. |