Geting error in post and category [closed]

Question

Hallo,

I have in my blog now add a Plugin [Custom Post Type UI] and have great a Post type movies and taxonomies like genre,actors,directer..... like this all ok now i have great a test post min add Movie and add info now come my big problem it show noting in post just a error

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/user*/public_html/****/**/wp-content/themes/telegraph/functions/wpzoom-functions.php on line 783

Lines 780-786

} elseif ( is_single() ) {
  $cat = get_the_category(); 
  $cat = $cat[0];
  echo get_category_parents($cat, TRUE, ' ' . $delimiter . ' ');
  echo $currentBefore;
//      the_title();
  echo $currentAfter;

can some on help me by this problem.

PS: do i have to add any code to my theme wen i great a Post type or Taxonomies in [Custom Post Type UI]

Answer 1

$cat = $cat[0]->cat_ID;

of course if $cat is not empty

Answer 2

Essentially somewhere in that code one of function fails to do what it should and informs about that by returning object of WP_Error class.

You can use is_wp_error() to check for such returns and methods of WP_Error class to retrieve errors (and then echo them or something).