If the Anti-cheat closes indicating Fatal error, please read the following solutions:
Fatal error 78
This is likely caused by malfunctioning hardware in your PC. Please test your RAM with memtest86+ and your CPU with Prime95.
Fatal error 95
Please uninstall Secret Folder if you have it installed and restart your PC in order to fix this issue.
If this solution does not work for you, we would kindly ask you to get in touch with us via this link and our dedicated CS team will assist in getting you up and running: Contact Support