Reference Assembly Error While using List<>

SudhirMuthalSudhirMuthal USUniversity ✭✭

Hi Guys
I am getting this constant error regarding adding reference to assembly
The type 'List<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Collections, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.

i have an interface

public interface IPhoneBookInformation
{
   Task<List<Contacts>> GetContacts();
}

after implementing this interface on my android project i am getting the above error.if any one knows about this error please help me out here.
Thanx guys,

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