c# - Ambiguous call between (Func<IInterface>) and (Func<Task<IInterface>>) -


why ambiguous call error between (func<iinterface>) , (func<task<iinterface>>) next code sample? , how can avoid error without replacing method group call? 

public class program {     public static void main(string[] args)     {         method(getobject);     }      public static iinterface getobject() => null;      public static void method(func<iinterface> func) =>          console.writeline("first");      public static void method(func<task<iinterface>> funcasync) =>          console.writeline("second");  }   public interface iinterface { }

this fix issue method expects function returns iinterface

public class program {     public static void main(string[] args)     {         method(() => getobject());     }      public static iinterface getobject() => null;      public static void method(func<iinterface> func) =>         console.writeline("first");      public static void method(func<task<iinterface>> funcasync) =>         console.writeline("second"); }  public interface iinterface { }

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