Computer will not update - PPA

[Rapidrob]

Welcome to Linux Lite 5.2 rapidrob

Monday 18 September 2023, 08:45:16
Memory Usage: 1143/7944MB (14.39%)
Disk Usage: 25/457GB (6%)
Support - https://www.freecinema2022.gq/forums/ (Right click, Open Link)

 rapidrob  ~  sudo apt-get update | tee ~/"$(date +"%Y_%m_%d_%T")-apt-get-update.txt"
[sudo] password for rapidrob:
Hit:1 http://repo.linuxliteos.com/linuxlite emerald InRelease
Hit:2 http://us.archive.ubuntu.com/ubuntu focal InRelease
Hit:3 http://archive.canonical.com/ubuntu focal InRelease
Hit:4 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:6 http://ppa.launchpad.net/dupeguru/ppa/ubuntu focal InRelease
Hit:7 http://security.ubuntu.com/ubuntu focal-security 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.
 rapidrob  ~  100  0 