After I used SASS library Compass in my website project, the browser console starts to log 404 Error like this
GET http://localhost:63342/Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/stylesheets/compass/css3/_animation.scss 404 (Not Found) index.html:44
GET http://localhost:63342/Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/stylesheets/compass/_support.scss 404 (Not Found) index.html:44
GET http://localhost:63342/Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/stylesheets/compass/css3/_transition.scss 404 (Not Found) index.html:44
GET http://localhost:63342/Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/stylesheets/compass/css3/_border-radius.scss 404 (Not Found) index.html:44
GET http://localhost:63342/Library/Ruby/Gems/2.0.0/gems/compass-core-1.0.1/stylesheets/compass/css3/_box-shadow.scss 404 (Not Found)
What's going on? How could I eliminate those?