Autodesk Moldflow Error 99998 Full May 2026

Use this template to create your own report (save as PDF or DOCX).

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.

| Cause | Likelihood | Fix Priority | |--------|------------|----------------| | Temp drive full | High | 1 | | Too many output steps | High | 2 | | 32-bit solver mode | Medium | 3 | | Antivirus blocking | Medium | 4 | | Corrupt study | Low | 5 | | Path length limit | Low | 6 | autodesk moldflow error 99998 full

If you want, paste the last 50 lines of the .out log file here, and I can interpret them for you.

Give me the part details and the full error context I should assume, then I’ll provide a step-by-step troubleshooting plan and corrective actions. Use this template to create your own report

I’ll assume a common scenario and start right away:

Moldflow includes a built-in repair utility: Because it is a generic "catch-all" error, the

Autodesk Moldflow is a powerful simulation tool, but like any complex software, it occasionally throws cryptic errors that halt analysis. Error 99998, often accompanied by the message "Unexpected internal system error" or "Solver failed to start," is one of the most frustrating issues for analysts because it provides no clear indication of the root cause.

This article explores the common triggers for Error 99998 and provides a step-by-step troubleshooting guide to resolve it.

Moldflow uses RAM first, but for large 3D meshes, it spills over into the Windows page file (virtual memory). If your page file is set to a fixed size (e.g., 16GB) and Moldflow needs 32GB, the allocation fails, and you get Error 99998.

Based on Autodesk support cases and user forums, the most frequent causes include: