Cannot start league anymore, please help!

Hey!

I tried posting this in Help and Support, but it got deleted three times in a row. I dont understand why?! D:

I am in desperate need of help, I cannot start league anymore. Whenever i try i get this (dutch) error:

http://imgur.com/a/xcClK

Please, help me.. what can I do? (I am veeery bad with computers)