Issue:
When you enter a command in AutoCAD, an error message similar to the following message is displayed on the command line: Command: _ai_molc Unknown command "AI_MOLC".
Press F1 for help. Causes: This problem occurs because the AutoCAD software is unable to load the function definitions in the acad.mnl file.
Commands such as Make Object's Layer Current and Deselect from the Right-click ShortCut Menu (among others) are defined in the acad.mnl file and do not function unless this MNL file is loaded in memory. Several AutoCAD core functions are defined in acad.mnl; if you modify menus or load menus other than the default without regard to this fact, the acad.mnl file may not load. In this case, the functionality is never defined. Solution: To resolve the error, load the acad.mnl file by typing the following on the command line in AutoCAD: (load "acad.mnl") Alternatively, make a copy of the acad.mnl file with the same file name as the MNU file: Make a copy of the acad.mnl file. Rename the copy of the acad.mnl to the same file name as the main MNU file you are loading. For example, if you are loading mymenu.mnu, rename the copy of acad.mnl to mymenu.mnl. Restart AutoCAD so it loads the MNL file you created.
You can also type MENU in the command line, it will open a window in the support file path, and the file named acad.CUIX should be listed. Reload the file, restart the program and see if the problem is then resolved. Ensure that no other custom cuix files are loaded, or in the default support file as located in
\Users\yourusername\AppData\Roaming\Autodesk\AutoCAD 2010\R22.0\enu\Support