"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.

Mở tài liệu tham khảo Docs tại phần High-level API: ReactCSSTransitionGroup và tái hiện lỗi bằng CodeSandbox được liên kết. So sánh các imports của ví dụ với API ReactCSSTransitionGroup, sau đó xác minh rằng ví dụ đã được sửa render mà không gặp lỗi invalid element type.