Deploy to github pages

Hi, I try to follow 's tutorial but for

git submodule add -b master public
Cloning into 'path/geoHeil/public'...
ERROR: Repository not found.
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
fatal: clone of '' into submodule path 'path/geoHeil/public' failed

do you know what is wrong here?

the problem is with -> this is the wrong path. You have to use the one github suggests to clone.