$ grunt serve

报错：

ERROR in ./src/images/yeoman.png

Module build failed: Error: Cannot find module 'file-loader'

    at Function.Module._resolveFilename (module.js:325:15)

    at Function.Module._load (module.js:276:25)

    at Module.require (module.js:353:17)

    at require (internal/module.js:12:17)

    at Object.module.exports (/Users/pan/git_test/gallery-by-react/node_modules/url-loader/index.js:18:20)

 @ ./src/components/GalleryByReactApp.js 12:15-46

webpack: bundle is now VALID.

-----------------------------------

我该从哪里查找问题哦？