How to fix error error-not-joined in Windows 11

Solution Steps

1. 1 Press Windows key + R to open the Run dialog. Type 'cmd' and press Ctrl+Shift+Enter to open Command Prompt as Administrator. Click Yes if prompted by User Account Control. This gives you the necessary permissions to view and manage drive mappings.
2. 2 In the Command Prompt, type 'subst' and press Enter. This lists all current virtual drive mappings. Look for any drive letter that appears in the list but is no longer valid (e.g., it points to a non-existent path). Note the drive letter.
3. 3 To remove the stale mapping, type 'subst : /d' (replace with the actual letter, e.g., 'subst Z: /d') and press Enter. This deletes the virtual drive assignment, clearing the error. If you need to recreate the mapping correctly, use 'subst : ' (e.g., 'subst Z: C:\MyFolder').
4. 4 If the error persists, check if any startup scripts or applications are trying to use the mapping. Press Win+R, type 'shell:startup' and press Enter. Look for shortcuts or scripts that reference the drive letter and update or remove them.
5. 5 Restart your computer to ensure all changes take effect. After reboot, verify the error is gone by trying to access the drive letter or running the application that previously failed.