Cant open the cilent

So i opened up my laptop today and it did a disc check before fully booting up, once it was done i went to open up league and i got the error shown below. help?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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