Github showing 404 error saying "The site configured at this address does not contain the requested file."

i’m trying to build my website and it continuosly showing error 404 saying "File not found

The site configured at this address does not contain the requested file."
this is my domain- https://imsouritra.github.io/

this is my repo- GitHub - ImSouritra/Imsouritra.github.io
please help me