Test run fails with message "ERT workflow failed, check the ERT log for more details"

[ashunigion]

After execution of flownet in assisted history matching mode, using

flownet ahm assisted_history_matching.yml flownet_output/egg_8_9_10_16

the execution stops with the following traceback

    Traceback (most recent call last):
      File "/home/as/miniconda3/bin/flownet", line 8, in <module>
        sys.exit(main())
      File "/home/as/.local/lib/python3.8/site-packages/flownet/_command_line.py", line 295, in main
        args.func(args)
      File "/home/as/.local/lib/python3.8/site-packages/flownet/_command_line.py", line 90, in flownet_ahm
        run_flownet_history_matching(config, args)
      File "/home/as/.local/lib/python3.8/site-packages/flownet/ahm/_run_ahm.py", line 969, in run_flownet_history_matching
        _set_up_ahm_and_run_ert(network, schedule, parameters, config, args)
      File "/home/as/.local/lib/python3.8/site-packages/flownet/ahm/_run_ahm.py", line 68, in _set_up_ahm_and_run_ert
        ahm.run_ert(weights=config.ert.ensemble_weights)
      File "/home/as/.local/lib/python3.8/site-packages/flownet/ahm/_assisted_history_matching.py", line 104, in run_ert
        run_ert_subprocess(
      File "/home/as/.local/lib/python3.8/site-packages/flownet/ert/_run_subprocess.py", line 70, in run_ert_subprocess
        raise subprocess.SubprocessError(
    subprocess.SubprocessError: The ERT workflow failed. Check the ERT log for more details. 

Kindly suggest steps to successfully demonstrate functionalities of the flownet, with test data.

Thank-you