Here's the error:

Notice: Undefined variable: out in /path/fromthemtous/perch/core/lib/PerchUtil.class.php on line 83

Notice: Undefined variable: Template in /path/fromthemtous/perch/core/lib/PerchFactory.class.php on line 620

Fatal error: Call to a member function find_all_tag_ids() on a non-object in /path/fromthemtous/perch/core/lib/PerchFactory.class.php on line 620

Great, thanks for the info!

Thanks for the fix. I get the list of categories for a particular set with:

$themes = perch_categories(array(
    'set' => 'themes',
    'skip-template' => true,
));

Now, I'd like to pull only the array of categories assigned to a particular item, in the context of a list / detail page. I'm doing something ugly for now:

// Getting the results
$getThemes = perch_content_custom('Episodes', array(
      'skip-template' => true,
      'filter' => 'slug',
      'match' => 'eq',
      'value' => perch_get('s'),
      'count' => 1
));

// Counting the number of array entries
$numThemes = count($getThemes[0]['themes']);

for($i=0; $i<$numThemes;$i++) {
    $currentTheme = $getThemes[0]['themes'][$i];

        // Setting the category path to perch_category
    $themes = perch_category($currentTheme, array(
        'skip-template' => true
    ));

    print_r($themes);
}

I believe there's a much cleaner way to do with Perch but I can't get it to filter the results for the particular slug. Something like. Could you help with the filtering part?

$themes = perch_categories(array(
    'set' => 'themes',
    'filter' => 'slug',
    'match' => 'eq',
    'value' => perch_get('s'),
    'skip-template' => true,
));

Sorry for bothering with this post, it's going on for a long time:) almost there!

Cheers,