absl.flags._exceptions.UnrecognizedFlagError: Unknown command line flag 'out_dir'

This error pops up everytime i try to run 'run-demo.py' from demo branch.

command: python3 run-demo.py
`Traceback (most recent call last):
File "run-demo.py", line 16, in
demo = Demo()
File "/home/vendy/Desktop/kwgraph/bi-att-flow-demo/basic/demo_cli.py", line 117, in __init__
config.out_dir = os.path.join(config.out_base_dir, config.model_name, str(config.run_id).zfill(2))
File "/home/vendy/.local/lib/python3.6/site-packages/tensorflow_core/python/platform/flags.py", line 88, in __setattr__
return self.__dict__['__wrapped'].__setattr__(name, value)
File "/home/vendy/.local/lib/python3.6/site-packages/absl/flags/_flagvalues.py", line 499, in __setattr__
return self._set_unknown_flag(name, value)
File "/home/vendy/.local/lib/python3.6/site-packages/absl/flags/_flagvalues.py", line 375, in _set_unknown_flag
raise _exceptions.UnrecognizedFlagError(name, value)
absl.flags._exceptions.UnrecognizedFlagError: Unknown command line flag 'out_dir'`