Cannot get passed the new launch screen

I open the PBE client, type my log in info.... get to the launch screen and click "Play" and get this error message... " Something unusual happened while trying to launch league of legends. Try closing and restarting, if this does not help contact us @ blah blah" []( So far ive uninstalled and reinstalled and this did not help, i cannot find anyone else with this problem please send help!
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