Not every combination of types has a file format registered with the IO mechanism.

To add a new format add something like the following line to one of your files:

#include "Ravl/DP/FileFormatBinStream.hh"

..

static RavlN::FileFormatBinStreamC<RavlN::SArray1dC<RavlN::MatrixC> > FileIO_ArrayOfMatrices;

Hope this helps