SSH to GitLab repository problem

[hiepph]

In config/deploy.rb I set config of repository to GitLab:

set :repository, 'git@gitlab.com:my_organization/my_repo.git'

I'm the master of the project, use Linux, mina deploy SSH to GitLab repository is fine and everything went smoothly.

But my colleague is owner of the project (higher privilege), use MacOS X, when he mina deploy turns out to be problem of SSH connecting to above Gitlab repository:

-----> Using RVM environment 'ruby-2.3.3@default'        
       Using /home/user/.rvm/gems/ruby-2.3.3 
-----> Creating a temporary build path        
-----> Fetching new git commits        
       ! ERROR:        GitLab: The project you were looking for could not be found.
Deploy f       fatal: Could not read from remote repository.
       
       Please make sure you have the correct access rights
       and the repository exists.
 !     ERROR: Deploy failed.
-----> Cleaning up build        
       Unlinking current 
       OK 

 !     Command failed.
       Failed with status 1 (19)

What happened?

[adam12]

Are you using deploy keys? If you're not, it's possible that your machine is forwarding keys, and his isn't.