This version of GitHub Enterprise was discontinued on August 3, 2016. No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, upgrade to the latest version of GitHub Enterprise. For help with the upgrade, contact GitHub Enterprise support.
This error means the key you are pushing with is attached to an account which does not have access to the repository.
To fix this, the owner of the repository (user) needs to add your account (other-user) as a collaborator on the repository or to a team that has write access to the repository.
