"High-level API: ReactCSSTransitionGroup" code example not working

Hey, I was recently looking at the docs and I found a code example that didn't work.
CodeSandbox for reference
Docs reference

This throws me this error -

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `TodoList`.

I guess this is some gotcha with imports.

Thanks.

開啟 Docs 中的 High-level API: ReactCSSTransitionGroup 部分，並使用連結的 CodeSandbox 重現該故障。比較範例的 imports 與 ReactCSSTransitionGroup API，然後確認修正後的範例能夠渲染，且不會出現無效元素類型錯誤。