title: Backend layout and typoscript not working for Basic2column in TYPO3
body: <p>I have created a backend layout with the name "doubleColumn". Now in the backend admin panel, I have 2 columns left and right. I have added some dummy content left and right column. But when I write typoscript for the doublecolumn template. Then it shows me an error to me in the front end. How can I fix this bug?</p>
  
  <p>This is the error I am getting</p>
  
  <blockquote>
    <p>Oops, an error occurred! Tried resolving a template file for
    controller action "Standard->index" in the format ".html", but none of
    the paths contained the expected template file (). No paths
    configured.</p>
  </blockquote>
  
  <p>More information regarding this error might be available online.</p>
  
  <p>Basic2ColumnPage.html</p>
  
  <pre><code>&lt;div class="left-column"&gt;
      &lt;f:format.raw&gt;{Leftcontent}&lt;/f:format.raw&gt;
  &lt;/div&gt;
  &lt;div class="right-column"&gt;
      &lt;f:format.raw&gt;{Rightcontent}&lt;/f:format.raw&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>DoubleColumn is a page name and I have added this typoscript in DoubleColumn template</p>
  
  <pre><code>page = PAGE
  page {
    10 = FLUIDTEMPLATE
    10 {
      file.stdWrap.cObject = CASE
      file.stdWrap.cObject {
        key.data = levelfield:-1, backend_layout_next_level, slide
        key.override.field = backend_layout
        1 = Text
        1.value = fileadmin/templates/demo/Resources/Private/Layouts/Basic2ColumnPage.html
      }
      variables {        
        Leftcontent &gt;StyleSheet.content.get
        Leftcontent.select.where = colPos=0          
        Rightcontent &lt; styles.content.get
        Rightcontent.select.where = colpos=1
      }
    }
  }
  </code></pre>
  
  <p>This is my Backend Layouts(TS-config)</p>
  
  <pre><code>mod.web_layout.BackendLayouts {
    exampleKey {
      title = Example
      icon = EXT:example_extension/Resources/Public/Images/BackendLayouts/default.gif
      config {
        backend_layout {
          colCount = 2
          rowCount = 1
          rows {
            1 {
              columns {
                1 {
                  name = Left content
                  colPos = 0
                }
                2 {
                  name = Right content
                  colPos = 1
                }
              }
            }
          }
        }
      }
    }
  }
  </code></pre>