Check Event Viewer and AutoCAD logs
Understanding and Fixing the AutoCAD pm16.dll Fatal Error When working with Autodesk AutoCAD, encountering a "Fatal Error" is perhaps the most frustrating experience for designers, architects, and engineers. One specific, notorious error message is:
Type STYLESMANAGER into the command line and press Enter. Delete any recently added or corrupted .ctb or .stb files.
Sometimes, corrupted plot configurations cause the error. Reset your AutoCAD settings to default to clear out corrupt registry paths [Source: Autodesk Knowledge Network ].
If you're experiencing issues with pm16.dll in AutoCAD, consider the following steps:
AutoCAD via the Control Panel -> Programs and Features.
In the Autodesk setup wizard that appears, select , then click Repair . Follow the prompts and restart your PC once finished. 5. Restore the DLL from Autodesk Content or a Clean Backup