The Vanguard Error VAN 57 in League of Legends occurs when Riot’s anti-cheat engine, Riot Vanguard, fails to start correctly. This issue arises because ...

Our guide goes over every error code that you will come across in League of Legends, what causes them and how to fix them.

Read on to learn what to do if you’re prompted with “There was an unexpected error with the login session” while playing League of Legends on your Windows 10 computer.