404 error when I check my website that I published through Github

I have been developing a same website game which I have been posting in the github server . And i got the message that my website got published on https://jg-07.github.io/ProjectH/ this link . But when I open this its showing 404 error that my file is not found . I am not sure why is this happening I was waiting for past 1 month to solve this problem but still is not done.