AssertionError when running basic manual mode

[janviebahn]

I installed ExpertOp4Grid via

pip3 install ExpertOp4Grid

Then I simply did

expertop4grid -l 9 -s 1 -c 0 -t 0

which gives the expected results but breaks at some point:

I don't know why. Output in Base Graph looks like this (nice figures)

[marota]

Have you installed graphviz ? If not see readme. Ideally we should catch if not installed before when using -s 1 mode