Why doesn't my 11ty site work?

So I have been following Kevin Powell’s tutorial on how to use 11ty as a static site generator. I managed to get all the steps done, but it somehow doesn’t work when I search for the admin page and the error information is too generic. Is there any mistakes in my file system or anything like that?

Link to the GitHub repository: GitHub - vishalscodes/shashiks: Shashi KS - Official Homepage Website

My site is being hosted on the “_site” folder.

All help is appreciated.