traffic_signal.lua:12: attempt to index global 'traffic_lights' (a nil value)

[rohitgirme]

Issue

I am using the below data / code

1. Latest OSM data from https://ftpmirror.your.org/pub/openstreetmap/pbf/planet-latest.osm.pbf.
2. Profiles from below
   

While preprocessing the latest OSM data with car profile car.lua from above zip, I get the below error
traffic_signal.lua:12: attempt to index global 'traffic_lights' (a nil value)

It seems to be coming from https://github.com/Project-OSRM/osrm-backend/blob/master/profiles/lib/traffic_signal.lua#L12
I preprocess(i.e. osrm-extract, osrm-contract) the data first, upload to S3 and then download it from S3 in 5.27.1 docker image start. This is so I don't have to run those expensive commands every time docker restarts.

Most relevant issues I could find were
#2288
Not related to OSRM but Lua
mkottman/AndroLua#20

None of these were helpful. Any suggestions?
Is it because the osrm-extract is from the v5.24.0?

Steps to reproduce

wget -q https://ftpmirror.your.org/pub/openstreetmap/pbf/planet-latest.osm.pbf
osrm-extract -p car_5_27_1.lua planet-latest.osm.pbf

Specifications

I am doing this currently in the osrm docker running v5.24.0. But I have copied the profiles for car.lua and dependent profiles/lib from above mentioned link so it works correctly with 5.27.1 osrm docker image.

[mjjbell]

Is there a reason why you are mixing and matching versions? In general, OSRM datasets are not compatible across minor releases.

[rohitgirme]

The error seems to be because I was using osrm v5.24 profiles. Closing as this is not a bug