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In ArcCatalog, it is possible to drag and drop a feature class that participates in a network dataset outside of the feature dataset. However this can cause problems. For example, it is then not possible to build the network dataset.
The feature classes of a network dataset are not supposed to be moved outside of their feature dataset.
Do not move the network dataset's feature class outside of the feature dataset. If they have already been moved outside of the feature dataset, move them back inside of the feature dataset.