| T2120 | FATAL ERROR: T2120 | SUBCOM COMMAND MUST PRECEDE SUBSEQ |
| Cause: | A SUBSEQ Case Control command was specified without a preceding SUBCOM command. | |
| Action: | Move the SUBSEQ command below a SUBCOM command or add a SUBCOM command above it. | |
| Remarks: | See Autodesk Nastran Reference Guide, Section 3, Case Control, for command format. |