After upgrading WordPress, can’t access admin interface

It most likely was a bad upgrade. You should manually download the latest WP version and overwrite all directories except wp-content. Your wp-config.php file won’t be overwritten. This should fix the issue.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)