Hello everybody! I work on the university computer with ArcGIS 10.2.2. I've encountered some problem with Network analyst. My aim is to build service areas around polygons. I try to load polygons with "Load Locations" tool. In the instruction from the webpage ( http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Adding_network_analysis_objects_to_network_analysis_classes) it's written, that it is possible (here I attach the screenshot from the instruction). But in my case there is the mistake (attached as mistake.png). Could you please possibly say what is wrong here and how can I adjust my polygon data in order to be recognised and added as a network facility? Thank you very much in advance!