QT and OpenCV error: core.hpp not found

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i have installed qt 5.0.2 with opencv 2.4.5 with windows 7 32-bit following this tutorial but when i finished i tested it using the example mentioned in the previous link but i had this error

error: opencv2/core/core.hpp: No such file or directory

could anybody help me please to determine whats the matter and how to solve it