So, I am getting this error on building Android Release. On debug things are fine. It wont even clean the solution.
Things were fine and now after updating to latest Xamarin.
This is what my Droid project top few lines look like

```
<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="..\packages\Xamarin.Build.Download.0.6.0\build\Xamarin.Build.Download.props" Condition="Exists('..\packages\Xamarin.Build.Download.0.6.0\build\Xamarin.Build.Download.props')" />
  <PropertyGroup>```

```