I added a new tier to my existing network and now am unable to rebuild the Network Topology. I received the ERROR 999999 code, so am stuck as to how to troubleshoot this. The message all of a sudden now says, The spatial index was not found for Structure Junction. How would adding a new Tier effect the spatial index of the Structure Junction?
You are most likely receiving this error because data was already appended to your UN feature classes.
Tiers should be added before appending data in the utility network feature classes. If data is appended before adding a new tier, an error will occur.