Issue on BigBlueButton Server 2.5.1

[ArmanEsf]

Hi everybody,

I've a BBB server 2.5.1(3020) on ubuntu 20.04 installed and even when I run the command manually it fails with this error :
root@bbb:/opt/bbb-video-download# sudo -u bigbluebutton docker-compose run --rm --user 998:998 app node index.js -i /var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP -o /var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP/video.mp4

[Start] Rendering downloadable video for BBB presentation { args: Namespace(input='/var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP', output='/var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP/video.mp4'), format: 'mp4', docker: true }

[Error] Failed rendering downloable video for BBB presentation { args: Namespace(input='/var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP', output='/var/bigbluebutton/published/presentation/INTERNALID-TIMESTAMP/video.mp4'), format: 'mp4', docker: true, workdir: './tmp/dataGOBlAf' } TypeError: Cannot read property '2' of undefined at transformCaptions (/home/bigbluebutton/modules/captions.js:19:55) at module.exports.createCaptions (/home/bigbluebutton/modules/captions.js:10:23) at module.exports.createVideo (/home/bigbluebutton/modules/processor.js:24:28) at async run (/home/bigbluebutton/index.js:10:9)

Any idea what should I do and what's my problem related to?
According to this Issue it should work manually work on a 2.5 server and needs a earlier version of ruby for the post script but I cant successfully run it manually.

Thanks in advance.