https://community.esri.com/t5/arcgis-utility-network-questions/new-tier-added-enable-network-topology-errors-out/m-p/1100803#M1378 <P>I added a new tier to my existing network and now am unable to rebuild the Network Topology.&nbsp; I received the ERROR 999999 code, so am stuck as to how to troubleshoot this.&nbsp; &nbsp;The message all of a sudden now says, The spatial index was not found for Structure Junction.&nbsp; How would adding a new Tier effect the spatial index of the Structure Junction?</P> Wed, 22 Sep 2021 13:44:01 GMT CristinHolmgren2 2021-09-22T13:44:01Z https://community.esri.com/t5/arcgis-utility-network-questions/new-tier-added-enable-network-topology-errors-out/m-p/1100803#M1378 <P>I added a new tier to my existing network and now am unable to rebuild the Network Topology.&nbsp; I received the ERROR 999999 code, so am stuck as to how to troubleshoot this.&nbsp; &nbsp;The message all of a sudden now says, The spatial index was not found for Structure Junction.&nbsp; How would adding a new Tier effect the spatial index of the Structure Junction?</P> Wed, 22 Sep 2021 13:44:01 GMT https://community.esri.com/t5/arcgis-utility-network-questions/new-tier-added-enable-network-topology-errors-out/m-p/1100803#M1378 CristinHolmgren2 2021-09-22T13:44:01Z https://community.esri.com/t5/arcgis-utility-network-questions/new-tier-added-enable-network-topology-errors-out/m-p/1101403#M1379 <P>You are most likely receiving this error because data was already appended to your UN feature classes.</P><UL><LI><P>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.</P></LI></UL><P><A href="https://pro.arcgis.com/en/pro-app/latest/tool-reference/utility-networks/add-tier.htm" target="_blank" rel="noopener">https://pro.arcgis.com/en/pro-app/latest/tool-reference/utility-networks/add-tier.htm</A></P><P>&nbsp;</P><P>&nbsp;</P> Thu, 23 Sep 2021 18:29:19 GMT https://community.esri.com/t5/arcgis-utility-network-questions/new-tier-added-enable-network-topology-errors-out/m-p/1101403#M1379 COI-GWEST 2021-09-23T18:29:19Z