If your League of Legends Client pops up with this error code: "There was an unexpected error with the login session. Please try again." Use these steps listed below to fix it! Press Alt+F4 on the client and click "sign out" not "exit". Press Ctrl + Shift + ...
If your problem seems to be account-related, try relogging and confirm you're using the right password. Ifthatdoesn't work, submit a ticket using the button at the bottom of this page and we'll see what we can do. Note that if your Riot Account has been permanently suspended, this ...