Error 99998 is a non-specific solver exit code. It essentially means the Moldflow solver process terminated unexpectedly before completing the analysis. Because it is a generic "catch-all" error, the cause can range from corrupt temporary files to insufficient memory permissions.
Check *.mfr or *.out log in study folder for exact error before 99998.
Example log snippet: autodesk moldflow error 99998 full
ERROR 99998: Solver terminated - insufficient memory for matrix solver.
Moldflow includes a built-in repair utility: Error 99998 is a non-specific solver exit code
Moldflow’s solver is CPU-intensive, but the UI uses the GPU. Switching GPUs mid-solve can trigger Error 99998. Check mesh integrity:
Real-time antivirus scanners (McAfee, Norton, Windows Defender) sometimes lock the .tmp files Moldflow creates in the %TEMP% folder. When the solver tries to write to a locked buffer, it sees it as “full” and throws error 99998.