LolClient.exe bug

I just finished playing a game of LOL last night, it was a gg, and I had fun. But when I get on to load it this morning, My league starts up, I am able to log in, and after I do I wait for about 3 seconds, then I get a little message in the middle of the screen telling me that LOL is unable to run for some odd reason. Can anyone help me out? (It says LolClient.exe has stopped working.)