Gem::LoadError: can't activate pg (~> 0.18), already activated pg-1.0.0 [duplicate] Gem::LoadError: can't activate pg (~> 0.18), already activated pg-1.0.0 [duplicate] ruby ruby

Gem::LoadError: can't activate pg (~> 0.18), already activated pg-1.0.0 [duplicate]


ruby-on-rails ruby postgresql bundler rails-migrations

looks like pg 1.0 is not compatible with rails 5.1.4 at the moment. 

gem 'pg', '~> 0.18'

0.18 worked for me.

ruby-on-rails ruby postgresql bundler rails-migrations

Turns out the postgres gem version 1.0.0 is not compatible with Rails 5.1.4. When I changed the postgres gem version to '~> 0.18', everything worked fine:

Changed from:

gem 'pg' # Defaults to latest version 1.0.0 (not compatible with Rails 5.1.4).

Changed to:

gem 'pg', '~> 0.18'

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