[magick-users] Help with Exception "No Decode Delegate for this Image Format"

[Louis Godio]

an anyone help me understand IM exception
"No Decode Delegate for this Image Format"

I've successfully compiled and linked  c++ code for IM++ 6,2,9   
 (  code for class Image and the decoder file png.c )

But I can only generete the above Exception  whenever  I try to run the
following simple main()

main( )
{  Magick ::Image im
  try
    {  im.read ("myfile_name.png")   }
catch (Exception &error_)
   {   cout << error_.what() ;  }

}

what else do I need to read a PNG image file in IM++  ???

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