Thread: expression error?

I've really stuck on this error.
Here's the code:

file : Foo.h

Code:

#ifndef FOO
#define FOO

// class declaration

template <class T>
class Foo {
	public:
		Foo( void );
		
		int foo( void ) const;
		
		~Foo();
};


// class definition

template <class T>
Foo<T>::Foo( void )
{return;}


template <class T>
int Foo<T>::foo( void ) const
{return 0;}


template <class T>
Foo<T>::~Foo()
{return;}

#endif

file : Foo2.h

Code:

#include "Foo.h"

#ifndef FOO2
#define FOO2

// class declaration

template <class T>
class Foo2 {
	public:
		Foo2( void );
		
		Foo<T> foo2( void ) const;
		
		~Foo2();
};

// class definition

template <class T>
Foo2<T>::Foo2( void )
{return;}

template <class T>
Foo<T>
Foo2<T>::foo2( void ) const
{return Foo<T> f();}

template <class T>
Foo2<T>::~Foo2( void )
{return;}

#endif

and the main.cpp file:

Code:

#include "Foo.h"
#include "Foo2.h"

int main( void ) {
Foo2<int> foo2();
Foo<int> foo = foo2.foo2(); // expression error!!!!!!
	
	return 0;
}

any help would be appreciated...