my LoL crash

hi im a boy on 12 year old and from denmark. But i got a little problem me and my friend played a game and then after the game we both cliked skip watching for stats and then we closed the program and when we open the program it only says reconect without im in a game when i click reconect is my screen black and there are the league of legends picture in the middle of the screen and sometimes there comes a box where it says try agian and cancel. please help me.