How can I add a featured thumbnail into a div via a data-image-src?

I asked a friend for help and solved it like this

<?php $thumb = wp_get_attachment_image_src( get_post_thumbnail_id($post->ID), 'NAME_OF_THE_THUMBNAIL_KIND' ); $url = $thumb['0']; ?>

<div id="featured" data-parallax="scroll" data-speed="0.1" data-natural-width="2304" data-natural-height="1536" data-ios-fix="true" data-position="top" data-bleed="10" data-image-src="https://wordpress.stackexchange.com/questions/220324/<?php echo $url ?>">

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