Autocad Fatal Error Unhandled Delayload Pm16.dll 95%
Sometimes the main AutoCAD is fine, but the "Migration Tools" feature is broken.
| Aspect | Rating | |--------|--------| | Impact | Severe (prevents launch) | | Ease of DIY fix | Moderate (Solution 1 is easy) | | Autodesk’s fault? | Yes – poor error handling and slow patching | | Recommended action | Use Solution 1 immediately, then perform a clean repair of Material Library when you have time. |
Bottom line: This error is terrifying but rarely indicates a hardware failure. In 90% of cases, renaming the Materials folder gets you back to work in under 2 minutes. Once stable, use the official Autodesk “Material Library Update” patch (available on their website for your version) to restore full material functionality.
Pro tip: After fixing, open AutoCAD > Options > System tab > uncheck “Automatic Material Library Download” to prevent this from recurring after future Windows updates.
The "FATAL ERROR: Unhandled Delayload 'pm16.dll' Module Not Found Exception" is a critical startup error that prevents AutoCAD and its specialized toolsets (like Plant 3D or Architecture) from launching. This error usually points to a breakdown in the communication between the software and the essential Windows libraries it needs to load during the "delayload" process. Common Causes of the pm16.dll Error
This error rarely indicates a missing file in the traditional sense; instead, it typically stems from environment or dependency issues:
Outdated Operating System: Missing Windows updates that contain critical system-level patches.
Corrupted Prerequisites: Damage to the Microsoft .NET Framework or Microsoft Visual C++ Redistributables, which act as the foundation for AutoCAD’s operations.
Missing Software Patches: Running an unpatched version of AutoCAD that lacks essential bug fixes for modern Windows environments.
Corrupted Installation: A partial or damaged installation where the software cannot correctly register or find its internal components. Step-by-Step Troubleshooting Guide
Follow these solutions in order, starting with the least invasive options. 1. Update Windows and AutoCAD
Before modifying software files, ensure your environment is current.
Windows Updates: Navigate to your system settings and run Windows Update. Install all pending updates, including optional ones.
Autodesk Updates: Use the Autodesk Access app (formerly Desktop App) or log into your Autodesk Account to download and install the latest service packs for your version. 2. Repair or Reinstall .NET Framework & Visual C++
AutoCAD depends heavily on these libraries. If they are corrupted, the "delayload" call for pm16.dll will fail.
Repair .NET: Use the Microsoft .NET Framework Repair Tool to automatically detect and fix issues.
Reinstall C++ Redistributables: Go to "Programs and Features" in the Windows Control Panel. Uninstall the Microsoft Visual C++ Redistributables (specifically versions 2015-2022) and download fresh installers from the Microsoft Support page . 3. Adjust Graphics Settings
Sometimes, a conflict with the graphics driver causes the startup module to hang.
"FATAL ERROR: Unhandled Delayload "pm16.dll" Module Not Found Exception at ..." when starting AutoCAD products
The FATAL ERROR: Unhandled Delayload "pm16.dll" Module Not Found Exception is a critical crash that typically occurs when launching AutoCAD, particularly version 2023. This error signifies that the software is attempting to load a specific library file (pm16.dll) that it either cannot locate or cannot properly execute due to system-level conflicts. Root Causes
Several underlying issues can trigger this specific DLL error: Autocad Fatal Error Unhandled Delayload Pm16.dll
Corrupted Installation: Missing or damaged program files often result from interrupted installations or power failures.
Outdated Dependencies: AutoCAD relies heavily on external frameworks; if the Microsoft .NET Framework or Visual C++ Redistributables are corrupted or outdated, the "pm16.dll" may fail to load.
Operating System Conflicts: Incompatibility between the AutoCAD version and the Windows build can prevent the module from being found.
Third-Party Software: Overzealous antivirus software or conflicting plugins can block the loading of essential DLLs. Recommended Solutions
According to Autodesk Support, the following sequence is effective for resolving the error:
The "Fatal Error: Unhandled Delayload pm16.dll" typically occurs when AutoCAD (frequently reported in 2023 versions) cannot find a specific core component during launch, often due to corrupted system libraries or a faulty installation. Step 1: Repair Core Windows Libraries
The most common cause for pm16.dll issues is an outdated or broken Microsoft Visual C++ or .NET Framework.
Update Windows: Ensure your operating system is fully up to date via Windows Update.
Reinstall Visual C++: Download and reinstall the latest Microsoft Visual C++ Redistributable packages.
Repair .NET Framework: Use the Microsoft .NET Framework Repair Tool to fix common installation issues. Step 2: Update Autodesk Components
If the libraries are fine, the licensing or login components might be preventing the DLL from loading.
Licensing Update: Sign into your Autodesk Account and download the latest Autodesk Licensing Service and Single Sign-On Component (AdSSO) updates.
Install Product Updates: Check for and install any pending hotfixes or service packs for your specific AutoCAD version. Step 3: Graphics Card Configuration
Sometimes, the error is triggered by how the system handles the software's graphical load.
Graphics Settings: Go to Windows Graphics Settings, browse for the acad.exe file, and set its preference to High Performance.
Update Drivers: Install the latest AutoCAD-certified graphics driver from your manufacturer (NVIDIA/AMD). Step 4: Perform a Clean Uninstall (Last Resort)
If the error persists, the original installation files may be corrupted beyond simple repair.
Clean Uninstall: Follow the Autodesk Clean Uninstall guide to remove all leftover folders and registry keys before reinstalling.
Browser Download: When reinstalling, use the Browser Download method from your Autodesk Account instead of the "Install Now" option to ensure a complete, stable installer package.
Are you seeing this error immediately upon launching the application, or does it happen when you open a specific drawing file? Sometimes the main AutoCAD is fine, but the
FATAL ERROR: Unhandled Delayload "pm16.dll" Module Not Found
typically occurs when AutoCAD is unable to load a required component during startup. This is often due to corrupted system files or an incomplete installation. Recommended Solutions
Autodesk recommends trying these steps in order to resolve the error: Update Your Operating System
: Ensure Windows is fully up to date by checking for and installing all pending updates. Repair or Reinstall .NET Framework : Corrupted .NET Framework components are a common cause. Use the Microsoft .NET Framework Repair Tool or manually reinstall it. Reinstall Microsoft Visual C++ Redistributables : This error can stem from missing or broken Visual C++ Runtime Libraries
. Uninstall existing versions and reinstall the packages required for your AutoCAD version. Install AutoCAD Updates : Check your Autodesk Account Autodesk Access app
for the latest updates, hotfixes, or service packs for your specific AutoCAD product. Perform a Clean Uninstall : If other methods fail, follow the Autodesk clean uninstall process
to remove all leftover files before performing a fresh installation. Additional Troubleshooting Disable Antivirus
: Temporarily disable antivirus or desktop locking software, as these can sometimes prevent the from loading correctly. Admin Permissions : Try launching Run as Administrator or test the program on a new Windows administrator profile to rule out permission issues. Hardware Acceleration
: If you can reach the startup screen before it crashes, try disabling hardware acceleration to see if a graphics driver conflict is the cause. Autodesk Community, Autodesk Forums, Autodesk Forum Does this error happen every time you open the application, or only when opening specific drawing files
Because AutoCAD is trying to load a legacy menu, we force it to rebuild from scratch.
.cuix .acad.CUIX to acad.CUIX.OLD.If none of the above works:
👉 Before reinstalling Windows or AutoCAD, always try the official Autodesk hotfix for your version – it fixes the majority of these cases.
Last tested: Works for AutoCAD 2019–2025. This error is almost never hardware-related.
How to Fix "Fatal Error: Unhandled Delayload Pm16.dll" in AutoCAD
Seeing a "Fatal Error: Unhandled Delayload 'pm16.dll' Module Not Found" message can be a total productivity killer. This error usually pops up right when you’re trying to launch AutoCAD, often after a fresh installation or a system update.
The good news? This is a known issue, and there are several proven steps to get you back to your drawings. What Causes the Pm16.dll Error?
This specific "Module Not Found" exception generally points to corrupted system dependencies or a damaged installation. The pm16.dll file is a critical component that AutoCAD needs to load during its startup sequence. If it's missing or if the underlying Microsoft frameworks are broken, the program simply gives up. Step-by-Step Solutions 1. Update Windows and Drivers
Before trying more complex fixes, ensure your foundation is solid.
Windows Updates: Run all pending Windows 10/11 updates. Sometimes a missing OS patch prevents DLLs from loading correctly.
Graphics Drivers: Outdated or uncertified drivers are a frequent culprit for fatal errors. Download the latest drivers directly from the NVIDIA, AMD, or Intel websites, or check for AutoCAD-certified drivers. 2. Repair .NET Framework and Visual C++ Look for files ending in
AutoCAD relies heavily on these Microsoft components. If they are corrupt, you'll see "Delayload" errors.
Microsoft .NET Framework: Use the official .NET Framework Repair Tool to fix common installation issues.
Visual C++ Redistributables: Go to your Windows Control Panel > Programs and Features and uninstall the Microsoft Visual C++ Redistributables (specifically versions related to your AutoCAD year). Then, download and reinstall fresh copies from the Microsoft website. 3. Perform a Clean Reinstall
If the steps above don't work, your AutoCAD installation files might be fundamentally "whacked".
Clean Uninstall: Don't just hit "Uninstall." Follow the Autodesk Clean Uninstall guide to remove all residual folders in ProgramData and AppData.
Fresh Download: Avoid using old installation files. Download a fresh installer directly from your Autodesk Account.
Disable Antivirus: Temporarily disable your antivirus or firewall during the reinstallation, as these can sometimes block the proper registration of DLL files. Quick Checklist Is your Windows OS fully up to date? Have you repaired the Microsoft .NET Framework? Did you try running AutoCAD as an Administrator?
If all else fails, have you attempted a Clean Uninstall and reinstall? AutoCAD Products Launch Error: Unhandled Exception c0000027
This "Fatal Error: Unhandled Delayload Pm16.dll" typically occurs when AutoCAD struggles to initialize specific plotting or performance-related libraries. Use the following guide to resolve it. 1. Launch with Graphics Acceleration Disabled
If the error occurs immediately upon launch, your graphics card may be causing a conflict. You can force AutoCAD to start without hardware acceleration.
Right-click your AutoCAD desktop shortcut and select Properties. In the Shortcut tab, find the Target field.
Go to the end of the existing path and add a space followed by /nohardware. Click Apply and launch the software. 2. Update Software and Licenses
Outdated software components are a common cause of .dll errors.
Open the Autodesk Access app or log in to your Autodesk Account to check for and install the latest updates for your specific AutoCAD version.
Ensure the Autodesk Desktop Licensing Service is updated to the latest version. 3. Configure High-Performance Graphics
Sometimes Windows defaults to an integrated GPU that cannot handle AutoCAD's requirements. Open Windows Settings > System > Display > Graphics.
Click Browse and navigate to the AutoCAD executable (usually located in C:\Program Files\Autodesk\AutoCAD 20xx\acad.exe). Once added, click Options and select High performance. 4. Reset AutoCAD to Defaults
Corrupted user profile settings can trigger unhandled exceptions. Go to the Windows Start Menu > AutoCAD 20xx folder. Select Reset Settings to Default.
Note: This will erase your custom palettes and shortcuts, so back up your settings first if possible. 5. Reinstall the Library If the Pm16.dll file itself is corrupted or missing:
Perform a Repair of the installation via the Windows Control Panel > Programs and Features. Select AutoCAD and click Uninstall/Change, then choose Repair or Reinstall.
Are you seeing this error at startup or when performing a specific command like plotting?