Specified virtual host already exists error

hello.
I am trying to point my domain " alhafizacademy.com " to my website " alhafez-academy.000webhostapp.com " but keep getting the error " Specified virtual host already exists "
my domain is not linked to any wbsite

It would appear someone signed up one month ago and used that custom domain with

https://alhafiz-academy.000webhostapp.com/

As far as I can see that custom domain is already setup?
You just need to correctly configure at domain registrar.

it was my old website… can i point the domain if i delete the old website ?

You can try parking it now, if it doesn’t work you won’t be able to use it here.