All-in-one event calendar – Catchable fatal error

I am not sure if this is where my post belongs but I am getting this error when clicking on Event titles in my calendar on a couple of different plugins. The current installed plugin is All-In-One Event Calendar. This is error I am getting when I click to get more details of an event: Catchable fatal error: Object of class WP_Error could not be converted to string in /homepages/5/d187188174/htdocs/dueckdressage/wp-content/themes/visionary/functions/breadcrumbs.php on line 44

Lines 43-48 are
} elseif ( is_single() && !is_attachment() ) {
$cat = get_the_category(); $cat = $cat[0];
echo get_category_parents($cat, TRUE, ‘ ‘ . $delimiter . ‘ ‘);
echo $currentBefore;
the_title();
echo $currentAfter;