This error can arise from the following cases:
- The input network dataset does not support turns.
- The output location for the turn feature class is a geodatabase and not a feature dataset within the geodatabase.
- The ability to model turns has not been specified while creating the network dataset. To support turns, the existing network dataset must be deleted and re-created with the ability to model turns.
- Inside a geodatabase, a turn feature class can be created only within a feature dataset. Specify a valid feature dataset as the output location for the turn feature class.