title: Xamarin Studio - Packaging error - "jarsigner.exe" exited with code 1. (MSB6006)
body: <p>I am attempting to build and deploy a debug version of my Xamarin Android application to an Android emulator. However I get the following error when trying to run the app in the emulator:</p>
  
  <p>"C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2,2): Error MSB6006: "jarsigner.exe" exited with code 1. (MSB6006) (TestApp)</p>
  
  <p>The strange detail is that I was able to build and deploy the same app with no issues yesterday. This error only appeared today. There have been no code changes in the project - so a code change has not caused the problem. </p>
  
  <p>I would appreciate any help from the SO community.</p>