Cant play LOL on mobile internet

Hello League of Legends friends. I tried to play lol on my moblie internet (giff-gaff united kingdom), but i have a problem... I can login, can do almost everyting, just except play. Like example, i join the match, choose champion everyting, but then it starts load all players to the game, my lol get crash... It says "You are trying to open the LoL's game client in invalid ways. To successfully open the game client, click on the play button and join the queue or create a custom game." But that not works even on custom game... Im using windows 8.1 operating system, my mobile phone is HTC m8. If someone knows how to fix it, or have same problem please help me. Thank you!
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