"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.

Docs の High-level API: ReactCSSTransitionGroup セクションを開き、リンクされた CodeSandbox を使って失敗を再現します。例の imports と ReactCSSTransitionGroup API を比較し、修正した例が invalid element type error なしでレンダリングされることを確認します。