Can't install from debian repo

I am following the instruction

Debian Based Systems

To install Stardog using apt-get run the following commands:

curl | apt-key add
echo "deb stable main" >> /etc/apt/sources.list
apt-get update
apt-get install -y stardog[=<version>]

This will first add the Stardog gpg key to the systems and then fetch and install the latest Stardog deb package.

At step 3 'apt-get update' I get the following error

Err:7 3 Release
  404  Not Found [IP: 80]
Hit:8 focal-backports InRelease
Get:9 stable/main amd64 Packages [4461 B]
Reading package lists... Done
E: The repository ' 3 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.

Actually step 4 may complete. Will update post shortly

Ok the error was not fatal, but probably should look to see why the error and add a note to ignore the error in the documentation.

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