Re-installing Mojave in Parallels

When Parallels upgraded it somehow corrupted Mojave. I’ve tried using the backup but I get an error saying there is no harddrive. I’ve created a Mojave install disk, went to Parallels, select + and tried to install it but it won’t open the install app on the drive.
Any ideas?

There are instructions for installing Mojave before and after upgrading to Catalina here: KB Parallels: Install macOS Mojave virtual machine with Parallels Desktop

My guess is you need to use the second method…