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because there is no file Box2D/Box2D.h
As far as I see you don't have Box2D project in your workspace. You have to have it there.
I add this in my workspace. but my project not build. If Ctrl+click then file find. what i do more?
To date, the file is not found Box2d.h. Check again the path to Box2d.h.
it can be somehow connected for project?