fatal error: opencv2/highgui/highgui.hpp: No such file or directory

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Hi I tried installing opencv with code::blocks and mingw in windows 7. I followed the steps as per the site "http://kevinhughes.ca/tutorials/opencv-install-on-windows-with-codeblocks-and-mingw/" and in the end i as successful in running the demo program hello world. bt when i added a line "#include "opencv2/core/core.hpp"" it shows "fatal error: opencv2/highgui/highgui.hpp: No such file or directory|". I'm a newbie. So please help me out. Thanks in advance