Autodesk Moldflow Error 99998 May 2026

Follow these steps in order. Do not skip the basic checks.

Real-time scanning tools (McAfee, Symantec, Windows Defender) often lock .tmp or .dat files as soon as Moldflow creates them. When the solver tries to write results, access is denied, triggering Error 99998. autodesk moldflow error 99998

Moldflow’s solver engine, inherited from legacy code (Moldflow Plastics Insight 6.1 and earlier), struggles with modern file paths containing spaces, parentheses, or non-English characters. Follow these steps in order

This solves 70% of Error 99998 cases.

Moldflow is RAM-hungry. A 3D mesh of 2 million tetrahedral elements can easily require 16-32 GB of RAM. If your physical RAM is full, Windows uses a page file on the SSD/HDD. If the page file is too small or the drive is full, Windows denies memory allocation requests. The Moldflow solver, unable to allocate memory, crashes with Error 99998. When the solver tries to write results, access

If Moldflow crashes while saving, it may leave behind a hidden .lock or .lck file. When you reopen the study, the system believes the file is still in use by another process.

Error 99998 is a non-specific failure code usually raised when the solver encounters a problem it can’t recover from. It often points to one of these underlying issues: