pushing to HeroKu : ERROR sqlite3

I have not really got to the source of the problem, I even read somewhere that heroku does not allow sqlite for security reason: who know the really story of why this does not work. Regardless here is the fix/

Add this code to the ruby gem file and commit it to your project and then you will be able to upload to heroku.

group :production do
 gem 'pg', '0.12.2'
 end
 group :development do
 gem 'sqlite3', '1.3.4'
 end