做锐道学习资料里7.3.1的例子，项目运行后网页报异常Cannot call method 'get' of undefined，软件上没有别的信息

[weixin_38066001]

 开发四年只会写业务代码，分布式高并发都不会还做程序员？->>>    TypeError: Cannot call method 'get' of undefined at dorado.widget.AbstractDataEditor.$extend.refreshExternalReadOnly (http://localhost:8080/standardlesson/dorado/client/base-widget.dpkg?skin=default&cacheBuster=1449210197379:3791:96) at dorado.widget.AbstractTextBox.$extend.refreshDom (http://localhost:8080/standardlesson/dorado/client/base-widget.dpkg?skin=default&cacheBuster=1449210197379:4350:14) at dorado.widget.Control.$extend.onAttachToDocument (http://localhost:8080/standardlesson/dorado/client/widget-support.dpkg?skin=default&cacheBuster=1449210197379:1395:26) at dorado.widget.Control.$extend.doRenderToOrReplace (http://localhost:8080/standardlesson/dorado/client/widget-support.dpkg?skin=default&cacheBuster=1449210197379:1366:18) at dorado.RenderableElement.$extend.render (http://localhost:8080/standardlesson/dorado/client/core.dpkg?skin=default&cacheBuster=1449210197379:1494:10) at dorado.widget.FormElement.$extend.refreshDom (http://localhost:8080/standardlesson/dorado/client/base-widget.dpkg?skin=default&cacheBuster=1449210197379:6110:24) at dorado.widget.Control.$extend.onAttachToDocument (http://localhost:8080/standardlesson/dorado/client/widget-support.dpkg?skin=default&cacheBuster=1449210197379:1395:26) at dorado.widget.Control.$extend.doRenderToOrReplace (http://localhost:8080/standardlesson/dorado/client/widget-support.dpkg?skin=default&cacheBuster=1449210197379:1366:18) at dorado.RenderableElement.$extend.render (http://localhost:8080/standardlesson/dorado/client/core.dpkg?skin=default&cacheBuster=1449210197379:1494:10) at dorado.widget.layout.Layout.$extend.renderControl (http://localhost:8080/standardlesson/dorado/client/widget-support.dpkg?skin=default&cacheBuster=1449210197379:3187:17)