Role table gone, Rails Devise on Heroku - ruby-on-rails

am new to rails & this is my first app .. I used devise & CanCan for authentication & authorization & there was a predefined set of roles for every user that I can assign it to ... Working perfectly on my local machine .. once deployed to Heroku & migrated the database everything seemed in place but when I tried to assign a role to a user there was none .
Any idea what's wrong?
I also wanted to disable the sign-up & only allow admins to create users
Thanks in advance
EDIT:
After too much searching I found out that the missing part is the Role table from the rolify gem, for some reason it refuses to migrate on the PostgreSQL/Heroku.
& the issue is raised in this link, still didn't find a solution that worked for me
https://github.com/EppO/rolify/issues/76

You might need to run all the migrations on Heroku. Do this: heroku run rake db:migrate and try again.

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Looking at this error message, you are missing invited_by_id column in your production database. Make sure you run your migrations on production environment and try again. That should fix your problem.
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