Error gem pg

DEBUG [febeba31] Command: cd ~/vivabien/releases/20150730023432 && ~/.rvm/bin/rvm default do bundle install --path ~/vivabien/shared/bundle --without development test --deployment --quiet
DEBUG [febeba31] 	An error occurred while installing pg (0.18.2), and Bundler cannot continue.
DEBUG [febeba31] 	Make sure that `gem install pg -v '0.18.2'` succeeds before bundling.
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as deploy@162.243.186.249: bundle exit status: 5
bundle stdout: An error occurred while installing pg (0.18.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.2'` succeeds before bundling.
bundle stderr: Nothing written

SSHKit::Command::Failed: bundle exit status: 5
bundle stdout: An error occurred while installing pg (0.18.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.2'` succeeds before bundling.
bundle stderr: Nothing written

Tasks: TOP => deploy:updated => bundler:install
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as deploy@162.243.186.249: bundle exit status: 5
bundle stdout: An error occurred while installing pg (0.18.2), and Bundler cannot continue.
Make sure that `gem install pg -v '0.18.2'` succeeds before bundling.
bundle stderr: Nothing written