React project deployment issue

ProcessError: Cloning into ‘C:\Users\naikh\OneDrive\Desktop\testing\node_modules.cache\gh-pages\https!github.com!HimansuWebCoder!repo.git’…
remote: Repository not found.
fatal: repository ‘https://github.com/HimansuWebCoder/repo.git/’ not found

why this issue happend?

404 is a server issue and there`s nothing you can do except report it or find another one.
The latter is probably the best option.