Perch blocks not appearing in blog app backend

Hello

I'm trying to implement blocks for use in the blog app however my text area isn't visible in the backend. My diagnostics report and template code are below.

Diagnostics

    Perch: 2.8.32, PHP: 5.6.27, MySQL: 5.5.32, with PDO
    Server OS: Linux, cgi-fcgi
    Installed apps: content (2.8.32), assets (2.8.32), categories (2.8.32), perch_blog (5.0), perch_mailchimp (3.0.1)
    App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_blog', 'perch_mailchimp' );
    PERCH_LOGINPATH: /perch
    PERCH_PATH: /home/beecrown/public_html/perch
    PERCH_CORE: /home/beecrown/public_html/perch/core
    PERCH_RESFILEPATH: /home/beecrown/public_html/perch/resources
    Image manipulation: GD
    PHP limits: Max upload 128M, Max POST 128M, Memory: 768M, Total max file upload: 128M
    F1: 2edba60ed1f613d6dd804feb202456a2
    Resource folder writeable: Yes
    HTTP_HOST: beecrowned.com
    DOCUMENT_ROOT: /home/beecrown/public_html
    REQUEST_URI: /perch/core/settings/diagnostics/
    SCRIPT_NAME: /perch/core/settings/diagnostics/index.php

Post.html code

<article class="h-entry">
    <h1>
        <a href="<perch:blog id="postURL" type="hidden" />" rel="bookmark" class="p-name">
            <perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" />
        </a>
    </h1>
    <p class="meta">
        <time class="dt-published" datetime="<perch:blog id="postDateTime" type="date" label="Date" time="true" format="Y-m-d H:i:s" divider-before="Publishing" />">
            <perch:blog id="postDateTime" type="date" time="true" format="%d %B %Y" /> 
        </time>


        <perch:categories id="categories" set="blog" label="Categories" display-as="checkboxes">
            <a href="/blog/category/<perch:category id="catSlug" type="slug" />" class="p-category <perch:category id="catTitle" type="slug" />">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>

    </p>

    <perch:blocks>
        <perch:block>
            <perch:blog id="postDescHTML" type="textarea" label="Post" order="3" editor="ckeditor" textile="false" html="true" markdown="true" size="xxl autowidth" required="true" />
        </perch:block>
    </perch:blocks>
</article>

<perch:blog id="excerpt" type="textarea" label="Excerpt" markdown="true" order="4" suppress="true" size="s" />
<perch:blog id="image_thumb" type="image" width="480" height="309" crop="true" suppress="true" label="Post Thumbnail" order="2"/>
<perch:blog id="image_thumb" type="image" width="480" height="309" crop="true" suppress="true" label="Post Thumbnail"/>
<perch:blog id="image_thumb" type="image" width="64" height="59" crop="true" suppress="true" label="Post Thumbnail" />

Any ideas?