Crash After Champ Select

After champion select, in the loading screen, my screen turns black and then a message appears and says ''Unable to connect to the server. Please check your network connection and attempt to reconnect to your game.'' the thing is, my network isn't the problem. I tried everything to make my network ''work''. Still doesn't work... I think the problem is League. I don't know how or why it does this, but right now I don' know what to do... Maybe its the new patch that did this, I did two games and then this came out. I never had this message before and its been two years I am playing... PS: Sorry for english I am french :)