C2509: '<Dispose>': member function not declared

Question

I'm trying to create a simple library that can be referenced in another application, and running into an error.

Library class:

	public ref class Game
	{
	public:
		Game();
		~Game();
	};

In my application:

[Platform::MTAThread]
int main(array<Platform::String^>^)
{
    auto game = ref new Gaia::Game();

    auto viewProvider = ref new ViewProviderFactory();
    Windows::ApplicationModel::Core::CoreApplication::Run(viewProvider);
}

Why am I getting the following error?

Error 1 error C2509: '<Dispose>' : member function not declared in 'x::Game' x\game.h 21 1 x