title: CKEditor won't let me paste and save content
body: <p>I am currently trying to use CKEditor on the website that I am developing with Visual Studio's ASP.Net. The feature seems to work fine if I type everything into the CKEditor forms, but once I start pasting content from an outside source, nothing seems to work. In web developer tools with Firefox and Chrome, I get the following error when I open the edit page (even before I've typed or pasted any content):</p>
  
  <p>Firefox:
  [11:00:07 GMT-0400 (Eastern Standard Time)] Browser Link: Failed to invoke return value callback:
  TypeError: t is null</p>
  
  <p>I don't know what "t" is. </p>
  
  <p>Chrome:
  [11:08:49 GMT-0400 (Eastern Daylight Time)] Browser Link: Failed to invoke return value callback:
  TypeError: Cannot read property 'files' of null</p>
  
  <p>I've tried putting in break points, but I still can't determine which files the editor can not read.</p>
  
  <p>On my "Edit" page, my code looks like this:</p>
  
  <pre><code> &lt;div class="form-group"&gt;
          &lt;label asp-for="JobSummary" class="col-md-2 control-label"&gt;&lt;/label&gt;
          &lt;div class="col-md-10"&gt;
              @Html.TextArea("JobSummary", new { @id = "JobSummary" })
              &lt;span asp-validation-for="JobSummary" class="text-danger" /&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  
  @section Scripts {
      @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
      &lt;script src="~/lib/ckeditor/ckeditor.js"&gt;&lt;/script&gt;
  
      &lt;script&gt;CKEDITOR.replace('JobSummary');&lt;/script&gt;
  }
  </code></pre>
  
  <p>In my bower.json file, I have this version of CKEditor: </p>
  
  <pre><code>"ckeditor": "4.5.10"
  </code></pre>
  
  <p>Any help with this would be greatly appreciated. I've been stuck on this for a couple of days. </p>