The operation requires a specific version of the trace network referenced in the error message. Review the specific help documentation for the operation for more information.
For example, the Set Flow Direction tool is not supported with trace networks of Trace Network Version 2 or later. For trace networks that are version 1 or later, use the FLOWDIRECTION network attribute field to set or modify the flow direction of a line feature in the network. Validate dirty areas to update the network topology with the new flow direction value.
Attempt the operation using a supported version of the trace network.