problem in using sub_matrix

Dear Sir/Madam,
              I am using the following code to get
submatrix of a given matrix.


#include <iostream>
#include <mtl.h>
using namespace mtl;
typedef matrix< double,
                rectangle<>,
               array< dense<> >,
               row_major>::type mlp2d;
int main()
{
    mlp2d a(6,6);
    mlp2d b(2,2);
    double counter=0;
    int i,j;
    for(i=0;i<6;i++)
    {
        for(j=0;j<6;j++)
        {
            a(i,j)=counter;
            counter++;
        }
    }
    b=a.sub_matrix(0,2,0,2);
    print_all_matrix(a);
	print_all_matrix(b);
    return 0;
}


and every time I get following errors........


mtl/matrix_implementation.h: In method
`mtl::row_matrix<typename
TwoDGen::submatrix_type, typename typename
IndexerGen::bind<typename
typename typename
TwoDGen::submatrix_type::type::size_type>::other>
mtl::row_matrix<TwoDGen, IndexerGen>::sub_matrix
(typename
mtl::matrix_implementation<TwoDGen,
IndexerGen>::size_type, typename
mtl::matrix_implementation<TwoDGen,
IndexerGen>::size_type, typename
mtl::matrix_implementation<TwoDGen,
IndexerGen>::size_type, typename
mtl::matrix_implementation<TwoDGen,
IndexerGen>::size_type) const [with
TwoDGen = mtl::gen_array2D<mtl::dense1D<double, 0> >,
IndexerGen =
mtl::gen_rect_indexer<mtl::row_orien, 0, 0, size_t>]':
test1.cpp:27:   instantiated from here
mtl/matrix_implementation.h:660: no type named
`is_strided' in `class
mtl::array2D<mtl::dense1D<double, 0> >'
mtl/matrix_implementation.h:661: no type named
`is_strided' in `class
mtl::array2D<mtl::dense1D<double, 0> >'
test1.cpp:27:   instantiated from here
mtl/matrix_implementation.h:664: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::ld () const'
test1.cpp:27:   instantiated from here
mtl/matrix_implementation.h:664: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::data ()
const'
mtl/matrix_implementation.h:664: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::ld () const'
test1.cpp:27:   instantiated from here
mtl/matrix_implementation.h:668: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::ld () const'
test1.cpp:27:   instantiated from here
mtl/matrix_implementation.h:668: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::data ()
const'
mtl/matrix_implementation.h:668: no matching function
for call to
`mtl::array2D<mtl::dense1D<double, 0> >::ld () const'


I am using g++ compiler in red hat linux.
Can you tell me what is wrong with it?
Thanking you in anticipation.
Best Regards,
Asharam Chhinpa.

=====
Asharam ChhinpaB-60, Aravali Hostel,IIT-Delhi.

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