there are errors in console, and no icon and draggable?

[liuweinan0575]

When I immediately apply the following code, there is one error. Besides, there is no icon for three node. And when I drag the root node, the second error appears.

`<Tree paddingLeft={20} tree={treeData} renderNode={this.renderNode} />

renderNode(node) { console.log(node); return {node.module} ; }

`