title: CleanWPPAllFilesInSingleFolder error makes my project no longer load
body: <p>Using VS2012 I created a dynamic data project. It all worked and then I started configuring the web deployment settings. I am not sure what setting I changed exactly as there was no error. However when I try and load the solution I get the following error for the project and it will no longer load.</p>
  
  <pre><code>Specified condition "$(CleanWPPAllFilesInSingleFolder)" evaluates to "" instead of a boolean. C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v11.0\Web\Microsoft.Web.Publishing.targets
  </code></pre>
  
  <p>I cannot see CleanWPPAllFilesInSingleFolder in the csproj file. Any ideas on how to fix this so that I can load the project once more?</p>