Description
The tier specified in the domain network has no subnetworks, or the subnetworks in the tier are dirty. To export a subnetwork, it must not be dirty.
Review the Subnetworks table for the subnetwork properties for the Input Tier value used in the tool.
Solution
Ensure that a subnetwork exists.
If subnetworks exist for the input tier but are dirty, run the Update Subnetwork tool to clean them.