How do I fix this error

[YudhishtaDhayalan]

fatal: remote origin already exists.

Developers-Mac-mini:RedTone Ring-3 YudhistaDhayalan$ git push -u origin --all

To https://bitbucket.org/YudhishtaDhayalan/apppppp.git

 ! [rejected]        master -> master (fetch first)

error: failed to push some refs to 'https://YudhishtaDhayalan@bitbucket.org/YudhishtaDhayalan/apppppp.git'

hint: Updates were rejected because the remote contains work that you do

hint: not have locally. This is usually caused by another repository pushing

hint: to the same ref. You may want to first integrate the remote changes

hint: (e.g., 'git pull ...') before pushing again.

hint: See the 'Note about fast-forwards' in 'git push --help' for details.

[Nic Brough -Adaptavist-]

That's not really a Bitbucket error, it's Bitbucket telling you what git has told it about the push.  You need to follow the advice in the hint it has given you.