Can't log in Oo

Everytime I click on "OK" after I opened the client this comes : https://i.imgur.com/eMggiHa.jpg

No idea what it should mean or what I could do about it, any ideas? xD

(restarted my computer already and the client a couple times too).

Thank you

OK fixed it, in case it happens to someone else here's the official thread how to ^^ http://na.leagueoflegends.com/board/showthread.php?t=3274503