SPA Sub Page Issue

I managed to get my navigation working following the tutorial. And it seems to work just fine. Except if you go directly to a sub page it comes up with a 404 error.

http://kopar.workbcpg.ca/ works just fine …

http://kopar.workbcpg.ca/about comes up with a 404 error …

Also, if you refresh the page when on a sub page it comes up with a 404 error.

Did I do something wrong?