the CalculateUserPointsJob job doesnt seem to work

[tungnguyenls2008]

Describe the bug a wonderful project, i have to say but the CalculateUserPointsJob seems unfinished, always gives me error that the object injected is null

To Reproduce Steps to reproduce the behavior:

1. Create new discussion
2. login to another user
3. comment on the discussion
4. See failed at job report
5. See failed jobs table updated with records

Expected behavior the job should work and update the points given to the user when user comments on another user's discussion

Screenshots