System.Security Version 2.0.0.0 not found.

I get the following when simply attempting to just use the mail.dll product in android test. It complies and test fine and does everything I need in the common library unit test. When I run the same test under the android test utility it fails.

/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: Error: Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'System.Security, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile? File name: 'System.Security.dll' at Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference reference, Mono.Cecil.ReaderParameters parameters) [0x00000] in :0 at Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference reference) [0x00000] in :0 at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences (System.Collections.Generic.List

1 assemblies, Mono.Cecil.AssemblyDefinition assembly, Boolean topLevel) [0x00000] in <filename unknown>:0 
  at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences (System.Collections.Generic.List

1 assemblies, Mono.Cecil.AssemblyDefinition assembly, Boolean topLevel) [0x00000] in :0 at Xamarin.Android.Tasks.ResolveAssemblies.Execute () [0x00000] in :0 (TestLibrary)