getResources is not getting my image TV from blog posts

[[!getResourcesTag?
  &elementClass=`modSnippet`
  &element=`getResources`
  &tpl=`blogPost`
  &parents=`3`
  &limit=`5`
  &includeContent=`1`
  &includeTVs=`1`   
&processTVs=`1`
  &tvPrefix=`tv`
  &showHidden=`1`
  &hideContainers=`1`
  &cache=`0`
  &pageVarKey=`page`
]]
[[!+page.nav:notempty=`
<div class="paging">  
<ul class="pageList">
[[!+page.nav]]  
</ul>
</div>
`]]

<div class="post">
    <h2 class="title"><a href="[[~[[+id]]]]">[[+pagetitle]]</a></h2>
    <p class="post-info">Posted by [[+createdby:userinfo=`fullname`]]
 [[+tv.tags:notempty=` | <span class="tags">Tags: 
[[!tolinks? &items=`[[+tv.tags]]` &key=`tag` &target=`1`]]
</span>`]]</p>
[[+tv.main_blog_video]]
[[+tv.main_blog_image]]

    <div class="entry">
    <p class="introtext">[[+introtext]]</p>
    </div>
    <p class="postmeta">
      <span class="links">
<a href="[[~[[+id]]]]" class="readmore">Read more</a>
| <a href="[[~[[+id]]]]#comments" class="comments">
    Comments ([[!QuipCount? &thread=`blog-post-[[+id]]`]])
  </a>
| <span class="date">[[+publishedon:strtotime:date=`%b %d, %Y`]]</span>
      </span>
    </p>

<hr/>
</div>