error running basic example on windows 10

Am trying to get started with basic example.
from within conda environment I ran:

`dopamine>python -um dopamine.discrete_domains.train --base_dir=/tmp/dopamine --gin_files='dopamine/agents/dqn/configs/dqn.gin'`

this gives:

```
File "G:\dopaminetest\dopamine\dopamine\discrete_domains\train.py", line 54, in main
run_experiment.load_gin_configs(FLAGS.gin_files, FLAGS.gin_bindings)
File "G:\dopaminetest\dopamine\dopamine\discrete_domains\run_experiment.py", line 50, in load_gin_configs
skip_unknown=False)
File "C:\Users\bob\Anaconda3\envs\dopaminetest\lib\site-packages\gin\config.py", line 1470, in parse_config_files_and_bindings
parse_config_file(config_file, skip_unknown)
File "C:\Users\bob\Anaconda3\envs\dopaminetest\lib\site-packages\gin\config.py", line 1438, in parse_config_file
raise IOError('Unable to open file: {}'.format(config_file))
OSError: Unable to open file: 'dopamine/agents/dqn/configs/dqn.gin'
```

pip freeze:

absl-py==0.7.1
astor==0.7.1
atari-py==0.1.7
certifi==2019.3.9
chardet==3.0.4
enum34==1.1.6
future==0.17.1
gast==0.2.2
gin-config==0.1.4
grpcio==1.19.0
gym==0.12.1
h5py==2.9.0
idna==2.8
Keras-Applications==1.0.7
Keras-Preprocessing==1.0.9
Markdown==3.1
mock==2.0.0
numpy==1.16.2
opencv-python==4.1.0.25
pbr==5.1.3
protobuf==3.7.1
pyglet==1.3.2
requests==2.21.0
scipy==1.2.1
six==1.12.0
tensorboard==1.13.1
tensorflow==1.13.1
tensorflow-estimator==1.13.0
tensorflow-gpu==1.13.1
termcolor==1.1.0
urllib3==1.24.1
Werkzeug==0.15.2
wincertstore==0.2

any help much appreciated