my leauge client wont let me log in. keep getting a error code 003 every time i go to open lol up

im so confused as to why it wont let me open up my client keep getting error code 003 can anyone help?
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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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