Facing error while installing bundle

Hi There,
I'm facing an issue while installing bundle, below is the error message -

An error occurred while installing pg (1.2.3), and Bundler cannot continue.
In Gemfile:
pg

Could you please help resolve this issue.
Thank You!

I faced the same problem on MacOS as all the postgresql modules were not properly installed.

On Ubuntu:
sudo apt install postgresql-contrib libpq-dev