ElemeFE / ElemeFE/element-react

引入Tree组件报错

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Description

### Description

Element ref was specified as a string (cnode) but no owner was set. You may have multiple copies of React loaded. (details: https://fb.me/react-refs-must-have-owner).

### Reproduce Steps

引入Tree组件就报错,直接用的官网代码,数据为空的时候能显示出来,一有数据就报错,用的是react的create-react-app创建的项目。所有配置没做修改

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