MySQL : ("SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)")

MySQL : ("SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)")
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MySQL : ("SQLSTATE[HY000] [1045] Access denied for user 'root'@'localhost' (using password: NO)")
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'root'@'localhost' denied NO)") Access for (using user MySQL : password: [1045] ("SQLSTATE[HY000]