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Could not load file or assembly System.Security


I'm trying to use Xamarin with EWS-Managed-API.
I've tested it on Windows and Mac. It was okay to build/execute.
but when I tried it on Xamarin.iOS and Android, Build was okay but I could not execute with the runtime error below.

System.IO.FileNotFoundException has been thrown
Could not load file or assembly 'System.Security, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.

It seems that the System.Security assembly may not included in the Xamarin.iOS System.Core.dll.
Is there any way to include System.Security assembly on Xamarin.iOS or is this a some bug ? I'm using latest Xamarin Studio now.

Thanks in advanced!

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