Unknown Command in AutoCAD

Last modified by Linus Karlsson on 2023/08/23 15:44

Sometimes when installing new versions of IMPACT applications, there can be some folders and files left from the previous version that was installed on the PC. These can cause the problem "Unknown command" when trying to do something in IMPACT for AutoCAD or IMPACT Reinforcement. To solve this, one need to uninstall the application(s) in which the problem is experienced and make sure that three specific folders are empty. The last thing to do is to clean out the Support File Search Path in AutoCAD. When this is done, it is time to install the application again, and one is good to go! 


Figure 1: Error message "Unknown command" when trying to draw a wall in IMPACT for AutoCAD

Step by step guide to solve the problem

Start with uninstalling the applications from Control Panel in Windows. There are two cases of this problem 

  1. Getting "Unknown command" in IMPACT for AutoCAD - uninstall all IMPACT applications except IMPACT Reinforcement. 
  2. Getting "Unknown command" in IMPACT Reinforcement -  uninstall IMPACT Reinforcement application and leave the rest of the IMPACT applications. 

When this is done, it is time to make sure that nothing from the applications is left in the folders. There are three folders to look in

  1. C:\"User"\AppData\Roaming\Autodesk\ApplicationPlugins
  2. C:\ProgramData\Autodesk\ApplicationPlugins
  3. C:\Program Files\Autodesk\ApplicationPlugins

These folders can be found by simply typing "%appdata%" or "%programdata%" or "%programfiles%" in Windows Explorer and then follow the above search path until one finds "ApplicationPlugins". Make sure that none of these folders contains any IMPACT folders or files. 


Figure 2: In this case, the folder in "AppData" contained nothing at all. 


Figure 3: In this case, the folder in "ProgramData" contained no IMPACT folders or files. Then one should just leave it as it is. 


Figure 4: In this case, the folder in "ProgramFiles" contained several IMPACT folders. These must be removed before one can continue. 

When all the above folders are cleared from any IMPACT folders or files, it is time for the last part. Start with opening Options in AutoCAD. Go to the tab Support File Search Path and remove all the search paths for the application causing the problem. 


Figure 5: If one is experiencing a problem with IMPACT for AutoCAD, remove all the search paths related to that application and leave the ones for IMPACT Reinforcement. 

Now, everything is done, and when the applications are installed again, everything should work just fine.