title: Excel Add In is not loaded. A runtime error occurred during the loading of the COM Add-In
body: <p>My VSTO Excel addin suddenly stopped working.
  The machine is Windows 8 x64 and i am using Excel 2010.
  The addin is written in visual studio 2010</p>
  
  <p>Here's what i tried</p>
  
  <p>The Loadbehaviour in the registry is 2.
  I changed it to 3 and load the addin, but still the addin is not loaded and LoadBehaviour is changed back to 2.</p>
  
  <p>Added the VSTO_SUPPRESSDISPLAYALERTS environment variable and set it to 0.
  Added the VSTO_LOGALERTS environment variable and set ti to 1.</p>
  
  <p>I restarted my excel and still addin is not loaded and i didn't get any error pop displaying the error message.</p>
  
  <p>I cannot find any log file and my search for *.manifest.log resulted no results.</p>
  
  <p>I am struck here and my addin is listed in inactive application addins and i can't find error why it is not active.</p>
  
  <p>Please bring me out of this. </p>