.babelrc error and more error

[zhi3210happy]

"stage-0",     这里多了一个逗号。
],

还有package.json里面devDependencies 和Dependencies 的react-dom 版本不一致。
babel-plugin-transform-decorators-legacy 没加入依赖

还有网页控制台报错home.js?a556:34 Uncaught (in promise) TypeError: Cannot read property 'length' of undefined
at Home.renderBanner (eval at (main.js:1715), :78:17)
at Home.render (eval at (main.js:1715), :279:28)
at eval (eval at (main.js:2120), :795:21)
at measureLifeCyclePerf (eval at (main.js:2120), :75:12)
at ReactCompositeComponentWrapper._renderValidatedComponentWithoutOwnerOrContext (eval at (main.js:2120), :794:25)
at ReactCompositeComponentWrapper._renderValidatedComponent (eval at (main.js:2120), :821:32)
at ReactCompositeComponentWrapper._updateRenderedComponent (eval at (main.js:2120), :745:36)
at ReactCompositeComponentWrapper._performComponentUpdate (eval at (main.js:2120), :723:10)
at ReactCompositeComponentWrapper.updateComponent (eval at (main.js:2120), :644:12)
at ReactCompositeComponentWrapper.receiveComponent (eval at (main.js:2120), :546:10)