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

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.

There are several ways to address a Netflix "unexpected error" message, including cache clearing for browsers or updating the app.