The acismobj20.dbx file is an responsible for handling 3D modeling data (specifically related to the ASM modeling engine) within AutoCAD. When this module fails, it triggers a "Fatal Error: Unhandled Access Violation" or "Module Not Found" exception, causing the program to abort immediately. Primary Causes
Navigate to the folder and then your specific AutoCAD folder. Click Reset Settings to Default . autocad fatal error acismobj20dbx free