Fatal error: Call to undefined function reset_mbstring_encoding

Do a complete update of WordPress, including all the files. The function named “reset_mbstring_encoding” is in the wp-includes/functions.php file and has been since 3.7, so if you’re missing it or some other file, then you need to make sure all the WordPress files are up-to-date.

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