PBE wont open

Hey guys, So I've been on the PBE for a while and I would always get on by pressing the icon for lol pbe in my home screen, but now for some reason its not working. I would click it and it would bounce once or twice and just go poof and nothing would open. Should I delete and download it. or is there something in the file that's mandatory that I may be missing Thanks :)
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