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.
Error 99998 is intimidating because of its generic description, but it is rarely a true software bug. In over 80% of cases, the issue is environmental—either a clogged temp folder, a bad file path, or a permission conflict. By systematically working through the steps above, you can resolve the error and get your analysis running again without reinstalling the software.
Have a different fix? Share your experience in the comments to help the community.
In Autodesk Moldflow, Error 99998 is a general licensing failure that indicates the solver (Insight) cannot find or check out a valid license. While the error log might occasionally include terms like "full," it is rarely a disk space issue; instead, it typically means the license pool is full (all seats are in use) or the solver cannot reach the server. Common Causes & Fixes
License Seats are Full: If your organization has a limited number of seats, Error 99998 often occurs because all available licenses for Moldflow Insight are currently being used by other analyses or users.
Fix: Wait for other jobs to finish or check the License Manager (LMTools) to see who is using the seats.
Solver vs. UI Mismatch: You may have a license for Synergy (the user interface) but not for Insight (the solver). Error 99998 specifically triggers when the solver starts and fails to find its own separate license.
Incorrect License Configuration: The Simulation Compute Manager (SCM) or the solver might be looking at the wrong license server.
Fix: Run the License Configuration Tool (found in the Moldflow Insight folder in the Start menu) and re-enter your server hostname and license level (Standard, Premium, or Ultimate).
Network/Firewall Blocks: A firewall might be preventing the solver from communicating with the license server on ports 2080 or 27000-27009.
Expired License: Verify in your Autodesk Account that your subscription has not expired. If you suspect Disk Space ("Full")
If the error truly relates to a "full" drive rather than a full license pool:
Clear Temporary Files: Moldflow generates massive temporary files. Check the temporary directory defined in your Simulation Compute Manager settings and ensure that drive has at least 50–100GB of free space.
Reset Job Manager: Sometimes the database for the job manager becomes bloated or corrupted. You can follow the guide to reset the Simulation Job Manager database to clear stuck jobs. Solved: ** ERROR 99998 ** - Autodesk Community
Troubleshooting Autodesk Moldflow Error 99998: Solving the "License Not Available" Issue
Few things are more frustrating than setting up a complex simulation only to be met with ** ERROR 99998 ** in your analysis log. This error typically states that a "Required license for AMI_STANDARD (or Premium/Ultimate) is not available". autodesk moldflow error 99998 full
While it might look like a solver failure, Error 99998 is almost always a licensing communication issue. Here is how to diagnose and fix it. Why is this happening?
The error occurs when the Moldflow Insight solver cannot reach or acquire a license from the server. Common causes include:
Missing Solver License: You may have a license for the UI (Synergy) but not for the solver (Insight).
Incorrect Configuration: The software is looking at the wrong server or using the wrong license level (Standard vs. Ultimate).
Network Timeouts: The request to the license server is taking too long and timing out.
Firewall Blocks: Security software is preventing the solver from communicating with the Network License Manager (LMTools). Step-by-Step Fixes 1. Run the License Configuration Tool
This is the most common fix for Moldflow 2023 and newer versions. Close all Moldflow instances.
Open the License Configuration tool (search "License Configuration 202x" in your Windows Start menu or find mlc.exe in the bin folder).
Ensure the License Mode is set to "Network" and the License Level (Standard, Premium, or Ultimate) matches your subscription. Verify the License Server hostname is correct. 2. Check Server Status in LMTools
If you manage your own license server, verify the licenses are actually active. Open LMTools on your server.
Go to the Server Status tab and click Perform Status Inquiry.
Look for feature codes like MFIB, MFIP, or MFIA (representing different Insight levels). If they aren't listed, your license file may be expired or missing the solver component. 3. Increase the FLEXLM Timeout
If your server is on a slow network or VPN, the solver might give up too early. Go to Windows System Environment Variables. Create a new System Variable named FLEXLM_TIMEOUT.
Set the value to 10000000 (10 million, which equals 10 seconds). 4. Clear Rogue Processes
Sometimes a previous crashed analysis "hangs onto" a license.
Open Task Manager and look for processes like flow.exe, cool.exe, or mhb3d.exe. Autodesk Moldflow is a powerful simulation tool, but
End these tasks manually to release the license back to the pool. When to Reinstall?
If you've verified the server is fine but the error persists, it may be an installation mismatch. Reinstalling the Autodesk Moldflow Insight License Configuration package specifically often resolves stubborn registry issues without requiring a full software reinstall.
For more detailed technical documentation, visit the official Autodesk Support page for Error 99998.
The dreaded Error 99998 in Autodesk Moldflow is a general solver failure that usually points to a breakdown in communication between the analysis engine and your computer’s hardware or temporary storage. When you see the "Full" designation attached to this error, it typically means the software has run out of space—either physically on your drive or within its allocated memory. 🛠️ Immediate Fixes for Error 99998 1. Clear Your Temporary Files
Moldflow creates massive scratch files during calculations. If your C: drive or designated Temporary Directory is full, the solver will crash instantly.
Locate your temporary folder (usually C:\Users\[Username]\AppData\Local\Temp). Delete all files beginning with s_ or mdt. Empty your Recycle Bin. 2. Check Disk Space and Project Location
Running simulations directly from a Network Drive or a Cloud Folder (like OneDrive or Dropbox) often triggers this error due to latency or "file in use" locks. Move your project (.sdy file) to a local SSD.
Ensure you have at least 2x the expected project size in free disk space. 3. Reset the Simulation Job Manager
Sometimes the communication link between the interface and the solver gets "stuck." Open the Simulation Job Manager. Cancel any "Hung" or "Failed" jobs.
Restart the service via the Windows Services menu (services.msc) by looking for Autodesk Simulation Job Manager. 🔍 Deep Dive: Why Does This Happen? Potential Cause What is happening? Mesh Density
Your mesh is too fine, creating more equations than your RAM can handle. Virtual Memory
Your Windows Page File is too small to handle the overflow from your RAM. Permissions
The solver doesn't have "Write" access to the temporary results folder. Antivirus
Your security software is scanning files while Moldflow tries to write to them. 💡 Pro Tips to Prevent Recurrence ⚙️ Optimize Your Hardware Settings
Increase Page File Size: Set your Windows Virtual Memory to at least 1.5x your physical RAM.
Update Graphics Drivers: Ensure your GPU drivers are certified for Autodesk products. Solutions to Autodesk Moldflow Error 99998 To resolve
Clean Boot: Close memory-heavy applications like Chrome or Outlook before starting a long-sequence analysis. 📐 Refine Your Model
Use Symmetry: If your part is symmetrical, use symmetry constraints to cut the element count in half.
Check for Mesh Errors: Overlapping elements or high aspect ratios can cause the solver to "diverge," leading to a 99998 crash.
If you’ve cleared your drive and the error persists, I can help you dig deeper. To narrow it down, tell me: How many elements are in your current mesh?
Are you running a Fill+Pack or a more complex Cool+Fill+Pack+Warp sequence? How much Free Space is currently on your C: drive?
Knowing these details will help us determine if the issue is your model's complexity or your IT environment.
Troubleshooting Autodesk Moldflow Error 99998: A Comprehensive Guide
Autodesk Moldflow is a powerful tool for simulating and analyzing the injection molding process. However, like any complex software, it's not immune to errors. One of the most frustrating errors users encounter is Error 99998, which can occur due to various reasons. In this blog post, we'll delve into the possible causes of Error 99998 in Autodesk Moldflow and provide step-by-step solutions to resolve the issue.
What is Autodesk Moldflow Error 99998?
Error 99998 in Autodesk Moldflow is a generic error message that indicates a problem with the software's functionality. The error message often appears without providing specific details about the cause, making it challenging to diagnose and fix. However, based on user reports and Autodesk support resources, we've identified some common causes of this error.
Causes of Autodesk Moldflow Error 99998
Solutions to Autodesk Moldflow Error 99998
To resolve Error 99998 in Autodesk Moldflow, try the following solutions:
If you are reading this, you have likely been staring at a red stop sign in the Autodesk Moldflow Insight or Adviser interface. You’ve just started a long-awaited analysis—perhaps a 3D warpage or a Cool (FEM) run—only to have it terminate within seconds. The dreaded Error 99998 appears in the log file, often accompanied by the word “Full” or a message indicating a memory allocation failure.
Error 99998 is one of the most cryptic yet critical errors in the Moldflow solver. Unlike standard mesh or material errors, this typically points to a hard limit in system resources or a corruption in the solver’s temporary data channel. The keyword “full” is the clue: something has reached 100% capacity.
In this guide, we will dissect the anatomy of Autodesk Moldflow Error 99998, provide a step-by-step diagnostic workflow, and offer permanent solutions to get your simulation running again.
Because 99998 is a generic crash code, there is rarely a single "fix." However, the error almost always stems from one of three categories:
Based on Autodesk support cases and user forums, the most frequent causes include: