In directory /usr/share/rubygems-integration/1.9.1/specifications/find files contains string like '<arel>, ["~> 3.0.2"]' (just `grep '~> 3.0.2' /usr/share/rubygems-integration/1.9.1/specifications/*.gemspec`). In such strings change '~>' to '>='. Repeat for '<tzinfo>, ["~> 0.3.29]'. Now you can run `rails server` without that bug.
In directory /usr/share/ rubygems- integration/ 1.9.1/specifica tions/find files contains string like '<arel>, ["~> 3.0.2"]' (just `grep '~> 3.0.2' /usr/share/ rubygems- integration/ 1.9.1/specifica tions/* .gemspec` ). In such strings change '~>' to '>='. Repeat for '<tzinfo>, ["~> 0.3.29]'. Now you can run `rails server` without that bug.