Autodesk Moldflow Error 99998 Exclusive May 2026

Ensure real-time scanning excludes Moldflow directories. Schedule full scans only during idle periods (midnight to 5 AM).

FLEXlm stores license borrow information in local cache files (e.g., debug.log, license.lic cache). If these files become corrupted—often after a forced shutdown or system crash—Moldflow may think it already has an exclusive license (false positive) and refuse to acquire a new one, or conversely, think it has no permission at all.

Some third-party automation tools (e.g., for parametric optimization) fail to release study handles properly, leaving exclusive locks behind.

Rating: ★☆☆☆☆ (0.5 stars for heart palpitations caused) autodesk moldflow error 99998 exclusive

In the high-stakes world of injection molding simulation, where we predict the flow of plastic down to the the micron, there exists a single error code that holds a mythical, almost urban-legend status among engineers. It is the "Blue Screen of Death" for the polymer crowd. It is cryptic, stubborn, and notoriously final.

It is Error 99998: Exclusive.

If you are reading this review, you have likely just encountered it. You have likely just spent three hours setting up a complex overmolding study with reactive molding elements, hit "Analyze," and watched your hopes crumble in milliseconds. This review covers the user experience, the root causes, and the existential dread associated with the infamous 99998. Ensure real-time scanning excludes Moldflow directories

An ounce of prevention is worth a pound of cure. Implement these best practices:

The "Exclusive" error does not mess around. Unlike other errors that offer a helpful suggestion (e.g., "Mesh has overlapping elements"), Error 99998 is a gatekeeper. It usually manifests at the very beginning of an analysis, often during the "Initialization" or "Input deck processing" phase.

The error message is blunt:

Error 99998: The file is locked exclusive by another process.

In layman’s terms, Moldflow is trying to read a file (usually the .stud or results file), but something else has grabbed it and refuses to let go. It is the software equivalent of walking into your own house and finding the door bolted shut from the inside.