Programming Error in deploying Django website on Heroku - django

Question

I am learning Django and wanted to deploy the app on Heroku. upon following the Heroku documentation on deploying the app to the platform. It is throwing errors.
I have 2 apps in the project:
blog (for writing the blogs)
userAuthentication (user auth)
Please help!
ERROR on Heroku deployed app:
ProgrammingError at /
relation "blog_categories" does not exist
LINE 1: ...categories"."name", "blog_categories"."name" FROM "blog_cate...
^
Request Method: GET
Request URL: https://sciencecreed.herokuapp.com/
Django Version: 3.2
Exception Type: ProgrammingError
Exception Value:
relation "blog_categories" does not exist
LINE 1: ...categories"."name", "blog_categories"."name" FROM "blog_cate...
^
Exception Location: /app/.heroku/python/lib/python3.9/site-packages/django/db/backends/utils.py, line 84, in _execute
Python Executable: /app/.heroku/python/bin/python
Python Version: 3.9.4
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: Thu, 29 Apr 2021 21:36:58 +0000
ERROR on executing "heroku logs"
The migrations work fine when running them locally with sqlite3 database but not on Heroku with PostgreSQL.
I tried running python manage.py makemigrations & python manage.py migrate on Heroku but no luck.
You can visit https://sciencecreed.herokuapp.com/ for the complete info of the error.