This error means that Easy Anti-Cheat has been uninstalled from your system.
If you have uninstalled the Public Test Server (PTS) for a game and then launched the main game, you may receive this error message.
To fix this, please reinstall Easy Anti-Cheat. Steps to do so can be found HERE
. Once complete, you should be able to start your game once more.
If you continue to receive this error message, please complete our general troubleshooting HERE.
Feel free to get in touch if you have any other questions.