you need to install pygraphviz to have graphs.... 

On Saturday, January 10, 2015 at 4:15:32 PM UTC+1, Raphael Viana wrote:
>
> Hello everyone,
> I started very recently in web2py world, but i have a problem.
> when i use a "graph model" web2py return for me a error message "graphviz 
> library not found"
>
> OBS:
> I'm using a web2py source code, and i set the variable on environment 
> variable system. I use Windows 8.1 pro.
>

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