Rails app has offending view in production mode
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I'm new to Heroku and recently deployed my rails app - it seems to run fine for the most part; I can reach my index, I can edit posts, and I can create new posts, but there's one view that just will not load. I've spent some time trying to figure out what the issue is but can't get it to work. I'll post the offending view here, and if anyone could give me some advice as to why this view won't render in the page that would be greatly appreciated. 

For reference, I'm receiving a Rails 500 error. It's also running fine in Development Mode, it's only in production that I'm receiving this error. 

Thanks in advance to anyone that can help.

    <head>
    <%= javascript_include_tag :all %> 
    </head>
    <div id ="header">
      <div id = 'logo_head'>A | K</div>
    </div>
    <body id="mainbody">

    <div id="content_show_head" class="mobile_column">
     <h1>
       <%= @post.title %>
     </h1>


    <div id ='slider_outter_wrap'>
    <div id ='img_wrap'><%= image_tag(@post.ftimg, :id => 'ftimg') %></div>
    <div id ='slider'>
     <div id='slide_inner_wrap'>
      <%= image_tag(@post.ftimg, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img1, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img2, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img3, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img4, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img5, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img6, :class => 'slidepic') %>
      <%= image_tag(@image_gallery.img7, :class => 'slidepic') %>
    </div>
    </div>
    </div>
    </div>

    <div id="content_show_body" class="mobile_column" data="default_scroll">
      <span class = "reading_area">
      <h2 class='reading_button'>Project:</h2>
      <p><%= @str = @post.subhead.html_safe %></p>
      </span>
      <span class = "reading_area">
      <h2 class='reading_button'>Description:</h2>
      <p><%= @str = @post.description.html_safe %></p>
      </span>
      <span class = "reading_area">
      <h2 class='reading_button'>Process:</h2>
      <p><%= @str = @post.process.html_safe %></p>
    </span>
      <span class = "reading_area">
      <h2 class='reading_button'>Made With:</h2>
      <span id="createdwith"><%= @str = @post.createdwith.html_safe %>
      </span>
      </span>
    </div>
    <div id = "reading_mask"></div>
    </body>
