Sudo apt update has error

General Help
1

Everytime i run sudo apt update or add a repository this error occurs
E: The repository 'cdrom://Zorin-OS 15.3 Lite 64bit bionic Release' does not have a Release file.

2

(Also I run zorin os lite 15.3 if it helps)

4

Thanks :relaxed:

BTW I dig this forum everyone is so helpful and I usually get an ans in under a day

6

Will do!