We are doing the network Analyst tutorial in the help (ArcGIS 10). In the first exercise, the students are supposed to create a new network dataset in the Transportayion feature dataset within the SanFrancisco.gbd. It worked fine for most students, but some got this error "There are no feature clases in the network container that can be added as feature sources" when they tried to create the new network dataset. they didn't do anything different than anyone else. What's the problem and how do I have them fix it? The frustration level is rising radidly in the class. Thanks.