templates may not be ‘virtual’

Given the code below, the compiler is showing a message pointing that error: templates may not be ‘virtual’. Does anyone have a suggestion on how to solve the bug?

template < class FOO_TYPE>
class CFoo{
    public:
        ...
        template < class BAR_TYPE >
        virtual void doSomething( const CBar<BAR_TYPE> &); // here's the error
        ...
        virtual ~CFoo();
    protected:
        MyClass < FOO_TYPE > * m_pClass;
};

template < class FOO_TYPE >
template < class BAR_TYPE >
void CFoo<FOO_TYPE>::doSomething( const CBar<BAR_TYPE> & refBar ){
    ...
}