heroku: [solved] failed to push some refs

I want to assume that you are getting this error message: *error: failed to push some refs* when you are trying to push your app to the remote git repository on heroku ?

Reason:

It maybe that your github default branch is main and not master or vice versa.

So to solve this problem you will have use your actual github default branch. In my case, I got the error because my github default branch isn't master but main.

So in my situaton instead of git push heroku master do:

git push heroku main

Your could be otherwise:

git push heroku master

But you have to confirm from your github repository