Cant play a ranked game

I was trying to play a ranked game and my whole entire client goes blank. Then it puts me back to ban a champ. I try to ban then get the error "Sorry we couldn't choose the champion you picked" or something like that. Now I'm stuck at the end screen with nothing to do but play with masteries and touch the runes. Its black with a 0 at the top. The image will represent more. Riot please fix this. This isn't cool I don't want a temporary ban or losing 3 LP. I'm trying to get out and I'm at 38 LP if this continues happening, I wont be able to do ranked anymore..... J:\Users\Dust111\Desktop\Snapshot_2017-6-23_10-50-44.jpg <------ Copy and place this to see image.