Probably a python 2/3 issue. I've made a change so please pull the branch again.
Something rebased on current master that compiles, but lacking both testing and features: https://github.com/eivindkv/FreeCAD/tre ... al_rebased
Vertices are not exported to the shape, so they can't be used. See https://forum.freecadweb.org/viewtopic. ... es#p154363