Gem::LoadError: Specified 'sqlite3' for database adapter, but the gem is not loaded

Question

I\'m trying to push my app to heroku but am getting this message.

Gem::LoadError: Specified \'sqlite3\' for database adaptor, but the gem is not loaded.
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Answer 1

Had same issue when starting a rails 5.0 tutorial on cloud9 IDE (amazon). Default sqlite3 version installed by running {rails new} within the cloud editor was 3.7.17 2013-05-20

this solved my problem : gem 'sqlite3', '~> 1.4.0'

After this I succeeded to launch the "yay you're on rails page"