I am running a qgis network script called "Transit-tools-QGIS" on qgis 2.12.3

I am interested in this script for my network:

https://github.com/chourmo/QGIS-Transit-tools/blob/master/scripts/Shortest%20paths%20-%20car.py

I get the error: No module named VectorWriter.

Can anyone advise me on this issue? I am also a qgis newb.