"Method Access Exception Error Code"

This issue can be fixed by deleting Unity completely and re-installing it. They followed the steps below: 1. Uninstall Unity from your machine entirely. (Both the Hub and any version of the Editor you have) 2. Delete all files in the path including .ULF: - Windows: C:ProgramData/Unity - Mac: Library/Application Support/Unity 3. Restart your machine (do not skip this step) 4. Download Unity again from our website, since your original install might be corrupt. Hub: https://unity3d.com/get-unity/download Editor: http://unity3d.com/get-unity/download/archive 5. Reinstall and launch the Hub with Admin Permissions (Windows only) - Right-click the Hub icon - Click 'Run as administrator.' 6. Reactivate Unity license