Vue项目执行 npm run dev 报错解决方法

Vue项目执行 npm run dev 报错解决方法 错误如下: Error: Cannot find module 'webpack-merge' at Function.Module._resolveFilename (module.js:440:15) at Function.Module._load (module.js:388:25) at Module.require (module.js:468:17) at require (internal/module.js:20:19) at Object. (D:\node6.2.0\node_global\etc\sellapp\co