Problems in simulating using Cmdenv - omnet++

I have been learning about OMNET++ with simu5G for the past few months and i encountered a problem when trying to simulate the network using command line (Cmdenv). The setup works fine with Qtenv, however, when i try to change the user interface to Cmdenv, i got error such as below:
Simulation batch Finished with Error <!> Error: Network '' or
'simu5g.simulations.demo.' not found, check .ini and .ned files
I have tried to change my working directory to a higher level, but it would results in error to parsing the xml file.
Looks forward for your kind help.

To run the simulation in cmd mode using gui window,
you can edit the run configurations (next option below "run as").
Select a value for configuration field. Not selecting a value here is raising the error you reported.
Change the option for user interface field from "Qtenv" to "Cmdenv"

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