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When running VBA code within ArcMap or ArcCatalog that includes references to Network Analyst objects, you get the following error message when you attempt to run the code:
'Compile error: User-defined type not defined'
esriNetworkAnalyst.olb and esriNetworkAnalystUI.olb are not included in the VBA list of references.
You need to include references to the Network Analyst OLB files.