I recently updated the bob and angel mods and I started getting a bug:
...ones__/data/entities/transport_drone/transport_drone.lua:449: attempt to index local 'map_color' (a nil value) stack traceback:
...ones__/data/entities/transport_drone/transport_drone.lua:449: in function 'make_ore_truck' ...ones__/data/entities/transport_drone/transport_drone.lua:600: in main chunk
[C]: in function 'require'
Transport_Drones/data-final-fixes.lua:107: in main chunk
And i dont know how to fix it

Same here. ＼（〇_ｏ）／

Functionality should work fine with following change. You may get a strange coloring on some drones, though.

At line 449 of transport_drone.lua file, right after line "local map_color = resource.map_color", add a line:

if not map_color then map_color={r=1} end

Somehow it's fixed now.~(￣▽￣)~