It's been 4 years since the original post, but I ran into this problem today. I'm in ubuntu 14.04. Originally I installed graphviz through the ubuntu repos with `apt-get` and `graphviz_draw` worked fine with pdf's. I removed my installation of graphviz and built from source and I get the same error mentioned above. The fix works, although its in 'graphviz_draw.py' not '__init__.py'.
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