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

I had this issue.

I had manually removed "pg (0.17.1)" from Gemfile.lock in an attempt to cover my tracks after neglecting to put the '--without production' param in for bundle install. Adding back solved the issue.