A client computer was unable to download packages from the Notification Server (NS).
The source paths (HTTP and UNC) under the package properties are blank on the NS agent, so there was no source location specified to download the packages.
ITMS (IT Management Suite) 8.x.x
Installing Package Service plugin on the Notification Server is not recommended. The Notification Server is a package server by default and installing the Package Service plugin will override the "built-in" package service on the NS, causing invalid package references and or duplication of packages.
Uninstall the Package Service from the Notification Server.
NOTE: If the Notification Server also has Deployment Solution Package server installed, DS Package plugin should be uninstalled with the built in policy before uninstalling Package Server plugin.
Uninstalling Package Service plugin from NS: