Hi,

I'm getting the following error on the image that was last updated 4 months ago 
(info from the docker hub):

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
/usr/lib/python3.6/site-packages/graph_tool/draw/graphviz_draw.py in 
graphviz_draw(g, pos, size, pin, layout, maxiter, ratio, overlap, sep, splines, 
vsize, penwidth, elen, gprops, vprops, eprops, vcolor, ecolor, vcmap, vnorm, 
ecmap, enorm, vorder, eorder, output, output_format, fork, return_string)
    319     try:
--> 320         if gv_new_api:
    321             gvg = libgv.agopen("G".encode("utf8"),

NameError: name 'gv_new_api' is not defined

During handling of the above exception, another exception occurred:

NameError                                 Traceback (most recent call last)
<ipython-input-4-3c9127bf2c6b> in <module>()
      3     #output_size=(1920,1080),
      4     #inline=True,
----> 5     output=home+'/g.png')

/usr/lib/python3.6/site-packages/graph_tool/draw/graphviz_draw.py in 
graphviz_draw(g, pos, size, pin, layout, maxiter, ratio, overlap, sep, splines, 
vsize, penwidth, elen, gprops, vprops, eprops, vcolor, ecolor, vcmap, vnorm, 
ecmap, enorm, vorder, eorder, output, output_format, fork, return_string)
    591         if has_layout:
    592             libgv.gvFreeLayout(gvc, gvg)
--> 593         libgv.agclose(gvg)
    594 
    595     if len(ret) > 1:

NameError: name 'libgv' is not defined
---------------------------------------------------------------------------

Before I looked at the source code I tried the possible quickfix of 'pip 
install graphviz', which did not help. After looking at the source code I 
learned why it didn't help, yet dunno right out of the bat how to fix this 
error. Any ideas? Would greatly appreciate it!

Kind regards,
Juan

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