No cockpit has been specified in the URL.
In beta versions of the NWBC runtime, the use of a cockpit in the URL was enforced. When calling NWBC with the URL /sap/bc/nwbc, an exception occurred to indicate that no cockpit is available. This error is always an indicator that the ABAP system is at a level that is not supported.
Update the service pack level to a supported minimum level.