| R4011 | WARNING: R4011 | SURFACE id REFERENCES AN UNDEFINED ELEMENT SET id |
| Cause: | The specified SURFACE command referenced an element SET that does not exist in the model database. | |
| Action: | Change reference to an existing element SET identification number or add the referenced SET to the model. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 3, Case Control, for command format. |