error: type 'nested class' is not derived from type 'class'

[wolfv]

What does this error message mean?

C:\Users\wolf\Documents\demo_MinGW>g++ staticDestroy4.cpp
staticDestroy4.cpp:25:35: error: type 'Wrapper::Employee' is not derived from ty
pe 'Wrapper'
   Manager& Employee::refManager = manager1;
                                   ^

The error comes from line 25:

#include <iostream>

class Wrapper
{
	public:
		class Manager
		{
			private:
				int j;
			public:
				Manager(): j(0) { }
				void print() { std::cout << " " << j++; }
		};


		class Employee
		{
			private:
				static Manager& refManager;
			public:
				void fn() { refManager.print(); }
		};

		Manager manager1;
		Manager& Employee::refManager = manager1;
		//error: type 'Wrapper::Employee' is not derived from type 'Wrapper'
};
/* this static member initilization compiles:
Wrapper::Manager manager0;
Wrapper::Manager& Wrapper::Employee::refManager = manager0;
*/
int main()
{
}

Thank you.