Dynamic talbe form

[ihor-zinchenko]

Hello. I have a form what looks like a table. The main thing is that form is dynamic, i can add columns and rows.
I wrote some code what adds columns and it works fine but when i trying add rows i got an error. Here is example of my code and what do i need.

https://codesandbox.io/p/sandbox/react-hook-form-d3g8pd