Bitbucket Authentication failed on pushing existing project

This is the error on my terminal:

Authentication failed for 'http://ift.tt/2fYKcuO'

This is what I did:

git remote add origin ssh://git@bitbucket.org/kboygitgit/sample_app.git git push -u origin master

then it asked for my username and password

then the error showed upp:remote: Unauthorized fatal: Authentication failed for 'http://ift.tt/2fYKcuO'

I need help since I am a learning progress in rails and btw I am using rails version 5.0.0.1