国际（冰岛）字符导致Rails错误

I'm running Rails 4 and using the gem 'acts-as-taggable' to keep track of tags on posts. All extremely simple and works as advertised locally on my machine. However on my VPS (Digital Ocean, Ubuntu 12.04) it doesn't. When saving the post it throws an error.I'm running Rails 4 and using the gem 'acts-as-