Vim(ruby):NoMethodError:未定义的方法“规范”

I'm using Vim 7.3 on Windows 7. When I try to open a .rb File i get this error. Vim(ruby):NoMethodError: undefined method `specifications' for "C:/Ruby192/lib/ruby/gems/1.9.1":String The file opens after I press Enter, but with no syntax highlighting. I have the following vim plugins: rails.vim surround.vim nerd_tree.vim nerdcommenter.vim snipmates.vimI'm using Vim 7.3 on Windows 7. When I try to o