title: Wordpress get custom post type tag list
body: <p>Trying to get the tag list for a single custom post type, have tried get_the_tag_list() and implementing the following, I only get the tags for the current post, not the whole lot for the custom post type.</p>
  
  <p>My code is:</p>
  
  <pre><code> $terms = get_terms( 'blog' ); print_r($terms); - to see if I get any output from the array, all I get is:  
  
   WP_Error Object ( [errors] =&gt; Array ( [invalid_taxonomy] =&gt; Array ( [0] =&gt; Invalid taxonomy ) ) [error_data] =&gt; Array ( ) )
  </code></pre>
  
  <p>Any help would be great.</p>