Image Cannot be loaded

I keep getting message ‘Image cannot be loaded. Make sure the path is correct and image exist.

I have image set up as a featured image to be displayed as a post thumbnails but once I click on it to enlarge the photo I keep getting this message.

I’m using this code for it:

<div class=”post-thumb”>
<?php if ( has_post_thumbnail()) { ?>
“><?php the_post_thumbnail(‘blog-thumb’); ?>
<?php } else { ?>
“><img src=”<?php bloginfo(‘template_url’); ?>/framework/images/no-thumb.png” />
<?php } ?>
</div>

Any ideas how I could solve this problem??
web address: https://donegaldiasporaaward.ie/#!prettyPhoto