How to run gtk3-demo?

[Zang Zhengrong]

When I run gtk3-demo in cygwin, I got error as below, what should I have to do next?

$ gtk3-demo
**
ERROR:/usr/src/ports/gtk3/gtk3-3.10.7-2.i686/src/gtk+-3.10.7/demos/gtk-demo/main.c:892:setup_default_icon: assertion failed: (pixbuf)
Aborted (core dumped)


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