perch_blog_post_categories(perch_get('s') not working

Hi, just trying to finish of a blog by adding the current categories for the current blog post the user is reading by using the perch_blog_post_categories function but for some reason its not outputting anything.

im using a custom template so my php is:

<?php perch_blog_post_categories(perch_get('s'), array(
    'template' => 'post_category.html',
)); ?>

and in there is:

<perch:if exists="perch_item_last">
    <span>and</span> <a class="last" href="archive.php?cat=<perch:category id="catSlug" type="slug" for="catTitle" />">
         <perch:category id="catTitle" type="smarttext" label="Title" required="true" />
    </a>
<perch:else />
    <a class="last" href="archive.php?cat=<perch:category id="catSlug" type="slug" for="catTitle" />">
        <perch:category id="catTitle" type="smarttext" label="Title" required="true" />,
    </a>
</perch:if>

Also in my debug ive noticed that the bit where its talking about using the template above there is no number or anything on the right hand side, its blank, normally theres at least a number of some sorts in there. Also it says something about cache file not found. Ive tried different stuff out on my local build and a proper server and nothing, even just the perch_blog_post_categories function on its own returns nothing…

Debug:

Debug Message
[1] SELECT * FROM perch2_pages WHERE pagePath='/news-and-views/post.php' LIMIT 1
[5] SELECT regionKey, regionHTML FROM perch2_content_regions WHERE regionPage='/news-and-views/post.php' OR regionPage='*' ORDER BY regionPage DESC
Using template: /templates/search/search-form.html
Using template: /templates/search/search-form.html
[1] SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch2_blog_index idx JOIN perch2_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch2_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='_id' WHERE 1=1 AND ((idx.indexKey='postSlug' AND idx.indexValue='testing-blog-categories')) AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey ) as tbl WHERE (postStatus='Published' AND postDateTime<='2016-09-12 10:43:00' ) GROUP BY itemID, sortval ORDER BY sortval ASC LIMIT 0, 10
[1] SELECT FOUND_ROWS() AS `count`
[23] SELECT DISTINCT settingID, settingValue FROM perch2_settings WHERE userID=0
[1] Using template: /templates/blog/post.html
[2] SELECT * FROM perch2_blog_authors ORDER BY authorFamilyName, authorGivenName ASC
[1] SELECT * FROM perch2_blog_sections ORDER BY sectionTitle ASC
[1] SELECT * FROM perch2_blogs ORDER BY blogTitle ASC
[2] SELECT * FROM perch2_categories ORDER BY catTreePosition ASC
Fetching from cache: perch_blog_post_categories536e15e73a06e52908a0814965c2b201
Cache file not found: perch_blog_post_categories536e15e73a06e52908a0814965c2b201
[1] SELECT * FROM perch2_blog_posts WHERE postStatus='Published' AND postDateTime<='2016-09-12 10:43:00' AND postSlug='testing-blog-categories'
[] Using template: /templates/blog/post_category.html
[4] SELECT SQL_CALC_FOUND_ROWS DISTINCT tbl.* FROM ( SELECT idx.itemID, main.*, idx2.indexValue as sortval FROM perch2_blog_index idx JOIN perch2_blog_posts main ON idx.itemID=main.postID AND idx.itemKey='postID' JOIN perch2_blog_index idx2 ON idx.itemID=idx2.itemID AND idx.itemKey='postID' AND idx2.indexKey='postDateTime' WHERE 1=1 AND idx.itemID=idx2.itemID AND idx.itemKey=idx2.itemKey ) as tbl WHERE (postStatus='Published' AND postDateTime<='2016-09-12 10:43:00' ) GROUP BY itemID, sortval ORDER BY sortval DESC LIMIT 0, 4
[1] SELECT FOUND_ROWS() AS `count`
[4] Using template: /templates/blog/post_in_side.html
[0] SELECT setID FROM perch2_category_sets WHERE setSlug='' LIMIT 1
[6] SELECT main.* FROM perch2_categories main WHERE 1=1 ORDER BY catTreePosition ASC
[6] Using template: /templates/categories/category.html
[1] SELECT pageID, pageParentID, pageDepth, pageTreePosition FROM perch2_pages WHERE pagePath='/private-clients' OR pageSortPath='/private-clients' LIMIT 1
[9] SELECT * FROM perch2_pages WHERE pageNew=0 AND pageHidden=0 AND pageTreePosition LIKE '000-002%' ORDER BY pageTreePosition ASC
[0] SELECT pageTreePosition FROM perch2_pages WHERE pagePath='/news-and-views/post.php' LIMIT 1
[8] Using template: /templates/navigation/item.html
[1] SELECT pageID, pageParentID, pageDepth, pageTreePosition FROM perch2_pages WHERE pagePath='/professional-partners' OR pageSortPath='/professional-partners' LIMIT 1
[3] SELECT * FROM perch2_pages WHERE pageNew=0 AND pageHidden=0 AND pageTreePosition LIKE '000-004%' ORDER BY pageTreePosition ASC
[0] SELECT pageTreePosition FROM perch2_pages WHERE pagePath='/news-and-views/post.php' LIMIT 1
[2] Using template: /templates/navigation/item.html
[1] SELECT pageID, pageParentID, pageDepth, pageTreePosition FROM perch2_pages WHERE pagePath='/corporate-clients' OR pageSortPath='/corporate-clients' LIMIT 1
[14] SELECT * FROM perch2_pages WHERE pageNew=0 AND pageHidden=0 AND pageTreePosition LIKE '000-003%' ORDER BY pageTreePosition ASC
[0] SELECT pageTreePosition FROM perch2_pages WHERE pagePath='/news-and-views/post.php' LIMIT 1
[13] Using template: /templates/navigation/item.html