Corruption to the the Notification Package upgrade from 9.x to 10.0.5.
Also note that in getting this error, the Plugin will still show up as installed in the "Installed Software" view of "Manage Clients" on the NV Server.
Step 1: Remove the existing Notification Plugin
Step 2: Go to the NetVault Home directory, and go into \packages\standard
Step 3: Double-click on the plugin nty-10-0-5-1.npk , this will install the Notification Plugin
Step 4: Go back into NetVault and test the Notifications to verify they work
If they still fail, follow the same instructions as previously, however this time install the following Plugin:
This should work, however if it still fails following this, please contact support.