I 'm looking into the first issue (others have been taken care of). I get this error in the nasal console:
Nasal runtime error: object has no size()
at C:/Users/Isaak/Documents/FlightGear/fgaddon/trunk/Aircraft/777/Nasal/autopush_route.nas, line 198
called from: C:/Users/Isaak/Documents/FlightGear/fgaddon/trunk/Aircraft/777/Nasal/autopush_route.nas, line 53
called from: C:/Users/Isaak/Documents/FlightGear/fgaddon/trunk/Aircraft/777/Nasal/autopush_route.nas, line 341
called from: C:/Program Files/FlightGear 2018.3.2/data/Nasal/globals.nas, line 119
The code at which it fails is var m = size(bezier);
I hope this helps you somehow in finding out what's happening.