How to get gitlab “Mirroring repositories” working to sync with github, again?

I was working as guided here and was video-recorded by me here, though now it’s not working any more. I also script the step into selenium webdriver here

So my question simply is how to get gitlab repo auto-synced to github? Also posted on stackoverflow here

p.s.

The desired behavior is that we can get gitlab commits synced to github repo automatically after configured. Currently it resutls as error as sample snapshot below

error @ synced to github