title: MSBuild Errors while building VSTO Addin's
body: <p>I recently migrated my VSTO Add in projects from "VS2008 and office 2007" to "VS2013 and office 2013", Changes took place as  below settings.</p>
  
  <ol>
  <li><p>.Net Framework version from 3.5 to 4.5(While upgrading project).</p></li>
  <li><p>I have added VSTO 2013 PIA assemblies to reference.</p></li>
  </ol>
  
  <p>That's it, when i tried to compile i have faced below MSBuild errors.</p>
  
  <pre><code>C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v12.0\OfficeTools\Microsoft.VisualStudio.Tools.Office.targets(268,13): error MSB4064: The "TargetFrameworkVersion" parameter is not supported by the "SignFile" task. Verify the parameter exists on the task, and it is a settable public instance property.
  C:\Program Files (x86)\MSBuild\Microsoft\VisualStudio\v12.0\OfficeTools\Microsoft.VisualStudio.Tools.Office.targets(264,9): error MSB4063: The "SignFile" task could not be initialized with its input parameters.
  </code></pre>
  
  <p>and i have tried to find solutions over the internet but couldn't find much, Any Solutions for this problem will be helpful.</p>