[Rails] cannot load such file -- unicode (LoadError)

I'm new to RoR and working on a migration of project developed by another team. I'm using Rails version (3.2.13) and my bundle install works successfully. However while running rails server, I get the error below. Any suggestions are most appreciated. Thanks! -- rails server output

[Rails] cannot load such file -- unicode (LoadError)

I'm new to RoR and working on a migration of project developed by another team. I'm using Rails version (3.2.13) and my bundle install works successfully. However while running rails server, I get the error below. btw, I'm using Windows 7 and unicode (0.4.4). Is that the correct version for