Keep reporting an error about the unavailability of react hooks

if I want to learn react hooks, I write it with the first official column, but I can"t run it.
I have installed the version "react": "^ 16.7.0-alpha.0" . The official website example is: 

   
 ask the Great God to solve
Javsscript react.js
Jan.18,2022

react-dom is also updated to this version?

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