在我的网站项目中使用 SASS 库 Compass 后，浏览器控制台开始像这样记录 404 错误
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)
这是怎么回事？我怎样才能消除那些？