League of Legend Game Crashed

My last two games crashed when I tried to play rank, did not even go to the loading screen. The game gave me a error saying

" A critical error has occurred and the process must be terminated. Would you like to create a crash dump to aid the developers in troubleshooting this issue? this may take up to 5 minutes.

Note: the process may appear unresponsive this time."

I click yes , than it tells me:

"A full memory dump of this process lets us better troubleshoot the issue, however, I generates considerably larger file that may take much longer to upload.

Would you like to take a full memory dump of the process? Select "yes" to generate a FULL memory dump. Select "no" to generate a small memory dump. Select "cancel" to exit."

I try both and it gives me another error saying that "there is not enough dump space"

I don't know what is going on, but I even try to play a normal game and it did the same think. PLEASE fix this issue because I lost two rank games because of this! and I cannot play anymore now!

what is the point in playing this game if it does not work properly?