title: 'WebForm_PostBackOptions' is undefined Error on ASP.Net website
body: <p>My precompiled ASP.Net 4 website has just developed a JavaScript error on a button click event that is supposed to postback to another page.</p>
  
  <p>I have never seen this error before and the site was working. What the heck have I done? I'm not even sure what code to show you???</p>
  
  <p>The page works fine when debugging in VS2010.</p>
  
  <p>I was hoping to launch the site today so any help would be greatly appreciated.</p>