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

It sounds like you might have either:

1. forgot to run bundle update or bundle install to update your Gemfile.lock file, or

2. forgot to commit your Gemfile and Gemfile.lock changes to Git with git commit before pushing to Heroku.

If your problem is the 2^nd case, then this question is a duplicate, I just have to find the canonical question around somewhere...