Cannot load pg_ext file

Question

When i try to run the server with rails s i get this issue:

/ruby-2.0.0-p247/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in `require':

cannot load such file -- pg_ext (LoadError)

Answer 1

Reinstalling rubygems(2.0.3) and rails(4.0.0) solved the problem.