Computer will not update - PPA

[Rapidrob]

===========================
Install Updates Error log
===========================
Install Updates could not fetch the package cache information lists.
Go to https://www.freecinema2022.gq/forums/ and paste the log below into a new or existing thread for assistance.

============ Log ===========

Hit:1 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://repo.linuxliteos.com/linuxlite emerald InRelease
Get:3 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease [114 kB]
Get:4 http://security.ubuntu.com/ubuntu focal-security InRelease [114 kB]
Hit:5 http://archive.canonical.com/ubuntu focal InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease [108 kB]
Hit:7 http://ppa.launchpad.net/dupeguru/ppa/ubuntu focal InRelease
Ign:8 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal InRelease
Err:9 http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release
  404  Not Found [IP: 185.125.190.52 80]
Reading package lists...
E: The repository 'http://ppa.launchpad.net/oguzhaninan/stacer/ubuntu focal Release' does not have a Release file.

*******************
I can update / upgrade from the command line.