Problem installing git-media

[chuenl]

I was following the install instruction but ran into a problem on the first step.
Could anyone explain what I need to do to resolve this?

$ git clone git@github.com:alebedev/git-media.git
Cloning into 'git-media'...
Warning: Permanently added the RSA host key for IP address '192.30.252.128' to the list of known hosts.
Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights and the repository exists.

[AndrewKvalheim]

GitHub Help ▸ SSH ▸ Error: Permission denied (publickey)