'Global_ExternalObject_NETWORK_EVENTS' with specified ID was not found
This can occur when attempting to open Associated Documents from Exor Network Event Manager (NEM)
Check the admin unit of the event you want to see the documents for
Right-click and select Associated Documents.
When in Document Manager ignore the error and select Scope near the top of the screen.
Put a tick in the scope for the admin unit of the event.
Close Document Manager and try right-click Associated Documents from Network Event Manager again.