Deployed django app error: Relation does not exist - django

Question

I deployed a django app using a postresql database with Heroku.
The app works perfectly on my local machine but when I want to create a user or to login using the deployed app, I run into the following error:
ProgrammingError at /register/
relation "register_user" does not exist
LINE 1: SELECT (1) AS "a" FROM "register_user" WHERE "register_user"...
^
Request Method: POST
Request URL: https://the-gecko.herokuapp.com/register/
Django Version: 4.0.3
Exception Type: ProgrammingError
Exception Value:
relation "register_user" does not exist
LINE 1: SELECT (1) AS "a" FROM "register_user" WHERE "register_user"...
^
Exception Location: /app/.heroku/python/lib/python3.9/site-packages/django/db/backends/utils.py, line 89, in _execute
Python Executable: /app/.heroku/python/bin/python
Python Version: 3.9.10
Python Path:
['/app/.heroku/python/bin',
'/app',
'/app/.heroku/python/lib/python39.zip',
'/app/.heroku/python/lib/python3.9',
'/app/.heroku/python/lib/python3.9/lib-dynload',
'/app/.heroku/python/lib/python3.9/site-packages']
Server time: Mon, 21 Mar 2022 19:59:58 +0000
I believe this error has something do to with my postgres database, but I don't know what relevant code to share in that case.
Please, let me know if you have any idea how to solve that issue.