error C2244: 'MyAnn::backPropgration' : unable to match function definition to an existing declaration

../cs461/c++/cppdef/backproagation.cpp(188) : error C2244:
'MyAnn::backPropgration' : unable to match function definition to an
existing declaration
        c:\cpw\msvc\cs461\c++\cppdef\../backpropagation.hpp(20) : see
declaration of 'MyAnn::backPropgration

inside backpropagation.hpp

namespace MyAnn
{
//......
template <typename T,
         template <typename ELEM, typename = std::allocator<ELEM> >
         class CONT
   >
   extern CONT<CONT<T> > backPropgration(
    const typename multiLayerExample<T, CONT>::mapInOut& examples,
    const T& rate,
    const typename CONT<T>::size_type& nIn,
    const typename CONT<T>::size_type& nOut,
    const typename CONT<T>::size_type& nHidden
   );
}

inside backproagation.cpp
.....
template <typename T,
         template <typename ELEM, typename = std::allocator<ELEM> >
         class CONT

CONT<CONT<T> > MyAnn::backPropgration(
    const typename multiLayerExample<T, CONT>::mapInOut& examples,
    const T& rate,
    const typename CONT<T>::size_type& nIn,
    const typename CONT<T>::size_type& nOut,
    const typename CONT<T>::size_type& nHidden
)