I am getting a 404 error for my Github Pages.

I am honestly a bit lost as to why I am getting this error, and I have tried changing the file name. Could anybody see what is the issue? My github repo for this is https://github.com/muhtasimz/muhtasimz.github.io. Attached below is the error I see. 

Hi @muhtasimz,

It looks like you were able to solve this issue. Would you mind letting us know what the problem was and what you did to solve it in case someone else has the same issue in the future?