title: Could not load file or assembly ':This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded
body: <p>I Hvea 3 projects in my solution:  BL, DL and the UI.  All three projectshave a target framework of >NET 4; I have double-checked this by looking at the property page for each project.  I am receiving the following error message when I try run the website at the hosting environment but not when I run it locally.</p>
  
  <pre><code>Could not load file or assembly 'BL' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
  </code></pre>
  
  <p>Thanks in advance!</p>