Can't install from git module

[areebbeigh]

pip install git+https://github.com/sphere-engine/python-client.git fails with:

Collecting git+https://github.com/sphere-engine/python-client.git
  Cloning https://github.com/sphere-engine/python-client.git to /tmp/pip-req-build-_vj_x7k3
Warning: Permanently added the RSA host key for IP address '13.234.210.38' to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:sphere-engine/client-commons.git' into submodule path '/tmp/pip-req-build-_vj_x7k3/client-commons' failed
Failed to clone 'client-commons'. Retry scheduled
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of 'git@github.com:sphere-engine/client-commons.git' into submodule path '/tmp/pip-req-build-_vj_x7k3/client-commons' failed
Failed to clone 'client-commons' a second time, aborting