PHP Fatal error: Call to undefined function WP_Filesystem() [closed]

The error is in custom-functions.php line 529 where you might be using file system function outside of admin, you can fix this by including the core admin file.php file like this.

require_once(ABSPATH . 'wp-admin/includes/file.php');

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