Filtering custom post using Ajax and taxonomies, keep getting 0

When i want to send html in ajax i do:

ob_start();
//here are echo that makes content 
echo '<p>Test</p>'
$response = ob_get_clean();

wp_send_json($response);//die is included 

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