Moq: Invalid callback. Setup on method with parameters cannot invoke callback with parameters

Question

I am trying to use Moq to write a unit test. Here is my unit test code:

var sender = new Mock<ICommandSender>();
sender.Setup(m => m.SendCommand(It.IsAny<MyCommand>(), false))
      .Callback(delegate(object o)
      {
          var msg = o as MyCommand;
          Assert.AreEqual(cmd.Id, msg.Id);
          Assert.AreEqual(cmd.Name, msg.Name);
      })
      .Verifiable();

SendCommand takes an object and optional boolean parameter. And MyCommand derives from ICommand.

void SendCommand(ICommand commands, bool idFromContent = false);

When the test runs, I see the error

System.ArgumentException : Invalid callback. Setup on method with parameters (ICommand,Boolean) cannot invoke callback with parameters (Object).

I want to check if the content of the message is what I sent in. I searched the forum and found a couple of different variations of this issue, but those didn't help. Any help is greatly appreciated.