Cannot cast inside the Action<T> parameter of Verify method

[SparrowWithBrokenWing]

I met an exception when trying to run the test that have the following code. When I try to make an expression that using a cast, this exception was throw by Moq: "System.ArgumentException : Unsupported expression: (IObserver)player". Why Moq don't allow to cast in this situation? Or I'm writing the test code in wrong way?

collectionOfMockForPlayer[1]
    .Verify((IPlayer player) => ((IObserver<IMove>)player).OnError(It.IsAny<MatchManager.IllegalMoveException>()), Times.Once());```