title: "Exception has been thrown by the target of an invocation." when building a Visual Studio 2010 VSPackage
body: <p>I recently create a couple of VSPackages for some Visual Studio extensions (menu bar/command).  I compiled them correctly yesterday, checked into TFS (i'm the only one touching this project, FYI).  I had already installed these extensions and were working fine.  Today it doesn't compile!  I get the following error:</p>
  
  <p><strong>Exception has been thrown by the target of an invocation.</strong></p>
  
  <p>This doesn't tell me anything, so i fired up Visual Studio with the following command:</p>
  
  <p>devenv.exe  /Rebuild > out.log</p>
  
  <p>In my out.log, I see the following:</p>
  
  <p><strong>C:\Program Files\MSBuild\Microsoft\VisualStudio\v10.0\VSSDK\Microsoft.VsSDK.targets(420,5): error : Exception has been thrown by the target of an invocation.</strong></p>
  
  <p>I have been stuck on this for hours and can no longer build these VSPackages.  Anyone?  This is really frustrating.  I have already tried cleaning project/rebuilding/build using Visual Studio itself (not command line)</p>