When you see Gem error like - "'': uninitialized constant Gem::SilentUI (NameError)" on June 20, 2011 Rails +
... the gem has no specification file. Run 'rake gems:refresh_specs' to fix this. on May 07, 2011 Rails +
Externalizing ALL application specific configurations to a file outside of Rails ROOT on February 01, 2011 Rails +