加载js和css文件出现Internal Server Error

GET http://127.0.0.1:3000/javascripts/jquery.js 500 (Internal Server Error) 127.0.0.1/:5 GET http://127.0.0.1:3000/javascripts/bootstrap.js 500 (Internal Server Error) 127.0.0.1/:6 GET http://127.0.0.1:3000/stylesheets/bootstrap.css 500 (Internal Server Error) 127.0.0.1/:7 GET http://127.0.0.1:3000/stylesheets/bootstrap-response.css 500 (Internal Server Error) 127.0.0.1/:8 GET http://127.0.0.1:3000/stylesheets/style.css 500 (Internal Server Error)

这个是什么错误呢？