Git - error failed to push some refs to git resolve?

I fetch this error i was working on my php project and when i need to add that project on my bitbucket account. so first i create repository on my bitbucket account and clone that repo. but when i push first time my projects i found following error:

error failed to push some refs to 
https://infotech@bitbucket.org/infotech/mycollege.git

I did try many to solve bellow issue, but i can't found proper solution at last i did try my own to git add like this way :

git add -A
git commit -m "setup project"
git push origin master
....

And Solve my issue, you can try this if you solve your problem.