Help with revert prefab and null reference

I was completing the Udemy RPG Dialogue & Quest video #43. Choosing State, the next button was not showing in the UI, so I reverted the core prefab and I have a lot of null references. I know that it is a variable that is not assigned, but these variables should not be assigned. How can I fix these? Thank you

I was able to fix it from the GameDev.TV Discord channel. When I reverted, 3 scripts were removed and I needed to add them.

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