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When attempting to use Loadbuilder with an method that uses a Service Area layer, the following error occurs:
Generally speaking this message indicates that one or more of the service area polygons are missing their corresponding element (the junctions used in the Thiessen polygon tool). This could happen if for example you deleted the junctions after creating the Thiessen polygon shapefile. It may help to add the shapefile as a background layer to visually see if any of the corresponding junctions are missing.
http://communities.bentley.com/products/hydraulics___hydrology/f/5925/t/108064