After creating my app I tried to push it and deployed it to Heroku but an annoying error occured (screenshot attached). I have seen that a lot of developers had the same problem on Heroku deployment therefore I decided to create this post.
Here is the steps I used to solve the problem:
Firstly, You need to
cd in to your project directory
Do the following:
cd path/to/root/of/your/project and try the command again.
rm -rf .git git init git add . git commit -am "Reinitialize" heroku create --stack cedar git push heroku master