Error with Masteries

Hi, every time I try and change masteries, I'm getting a message saying 'an unexpected error has occurred. Sorry about that. We've sent a report to the server. It won't let me change and I've been playing jungle gragas with warrior's bloodlust. Anyone have any advice or ideas? Oh and by when it won't change, I mean on the tree, I can't save the page if I alter what's currently there, Thank you!

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