Install Updates Error log

[Mi St]

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

Log
===

Hit:1 https://linux.teamviewer.com/deb stable InRelease
Ign:2 http://linux.dropbox.com/ubuntu disco InRelease
Ign:3 http://ppa.launchpad.net/librecad-dev/li...ble/ubuntu focal InRelease
Hit:4 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5 http://archive.canonical.com/ubuntu focal InRelease
Hit:6 http://linux.dropbox.com/ubuntu disco Release
Err:7 http://ppa.launchpad.net/librecad-dev/li...ble/ubuntu focal Release
  404  Not Found [IP: 2001:67c:1560:8008::19 80]
Hit:8 http://us.archive.ubuntu.com/ubuntu focal InRelease
Ign:9 http://repo.vivaldi.com/stable/deb stable InRelease
Hit:10 https://repo.skype.com/deb stable InRelease
Hit:11 http://repo.vivaldi.com/stable/deb stable Release
Hit:12 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:13 http://us.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:14 http://us.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:15 http://sft.if.usp.br/linuxlite emerald InRelease
Reading package lists...
E: The repository 'http://ppa.launchpad.net/librecad-dev/librecad-stable/ubuntu focal Release' does not have a Release file.