error: React is not defined, when i try deploying to github pages - reactjs

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i get this error, can someone help me?
ive used the install gh-pages, and it publiches but dosnt work

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How can I fix error 404 when publishing my github page?

Could someone please help me to publish my website on github?
I created a repository where I uploaded all my files. Then published it. However, when I go to my URL, I get an error 404 - please see here https://camielalli.github.io/.
This is my repository: https://github.com/camielalli/camielalli.github.io
I'm a complete beginner with github and creating a website, so I'm sure there's something very obvious that I'm missing out on.
Thanks ever so much for anyone who will help me :)

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Here is an image of the website
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i made first react app and when i upload it on github i only see blank page on github page

hi so im trying to upload page made in react to github at start i ran into problem of it showing me only README file but i managed to solve that by following deployment guide on react website and that help well kind of, now i ran into other problem which is that github is just showing me blank page i don't understand why is it like this cuz i changed file and it shouldn't be empty and here is git repository for non- npm build version of page and also here is git repo for the build version of page that is just blank, am i running in this problem cuz i used npm build wrong way? how do i fix it? thanks in advance
I had the same problem and I found easier to use Netlify to upload websites.
I think if you are using only an html file you can just set the github pages with root and it shouldn't reuqire to use build run, I think the build command it is for projects done with frameworks/more complext. Try to do like that maybe it will work.

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Here's a screenshot of the error:
Am I missing something?
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https://nextjs.org/learn/basics/deploying-a-nextjs-app/deploying-to-zeit-now
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