Can't locate Graphics/Magick.pm in @INC

Can't locate Graphics/Magick.pm in @INC (you may need to install the Graphics::Magick module)
This kind problem i am facing whenever i am trying to run a graphicsmagick program.
My code was very simple:
  1 use warnings;
  2 use Graphics::Magick;
  3
  4 $image=Graphics::Magick->new(size=>'300x300');
  5 $image->Read('xc:white');
  6 $image->Write('black.png');