my android phone cannot connect my modem router it is showing authentication problem

authentication problem in my lenovo A6000y
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    Authentication error is often the result of typing the wireless key incorrectly, or typing some of the letters in the wrong case, because wireless keys are case-sensitive.

    So open your router's configuration utility and double-check the wireless key in the wireless settings.
    When entering that key on your phone, you must type it exactly as it appears in the router config utility.
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