Thank you for providing this github repository for the tutorial as it was invaluable identifying the issue.

The code works with axios version 0.21.1 specified in package.json in this repsitory. 👍
The code still works if you upgrade to axios version 0.22.0 👍

However, there is a breaking change in axios version 0.23.0 👎 that results in an error in add-tutorial.component.tsx

I will try to resolve the issue on my own and update this issue, but I am still new at this.