Mobian repository status

[biketool]

I looked at the output form apt update:
and this was in there along with good hits on the http://repo.mobian-project.org/unstable repo

Code:

E: The repository 'http://deb.debian.org/debian/sid main Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

/etc/apt/sources.list

Code:

deb http://deb.debian.org/debian/unstable/ main contrib non-free

What is wrong with that line??