Question Having trouble with the mlagents-learn command. ml-agents release 18, package 2.1.0

I have been following along with the "Making a New Learning Environment" documentation tutorial at - https://github.com/Unity-Technologi..._docs/docs/Learning-Environment-Create-New.md

I get close to the end - the step where I enter the command:
mlagents-learn path/rollerball_config.yaml --run-id=RollerBall

I get the error:
mlagents.trainers.exception.TrainerConfigError: The option behaviors was specified in your YAML file, but is invalid.

Which I find a little odd due to the "" symbols, like it can't say exactly which option it doesn't like.
I am using the file contents given in the tutorial's YAML file:

Code (YAML):

1.  
2. behaviors:
3.   RollerBall:
4.    trainer_type: ppo
5.    hyperparameters:
6.      batch_size: 10
7.      buffer_size: 100
8.      learning_rate: 3.0e-4
9.      beta: 5.0e-4
10.      epsilon: 0.2
11.      lambd: 0.99
12.      num_epoch: 3
13.      learning_rate_schedule: linear
14.    network_settings:
15.      normalize: false
16.      hidden_units: 128
17.      num_layers: 2
18.    reward_signals:
19.      extrinsic:
20.        gamma: 0.99
21.        strength: 1.0
22.    max_steps: 500000
23.    time_horizon: 64
24.    summary_freq: 10000
25.  

Can anyone point me in the right direction or have any ideas on what I can try next?

 

I would say it's because you put behaviors twice in your file, delete the first two lines

 

Thanks for pointing that out - that was a copy past mistake I made in the post. Unfortunately, I didn't make the mistake in my YAML file, so I'm still getting the error

 

That was exactly what I needed! I was able to open the YAML file with notepad++ and change the encoding to UTF-8 without BOM and mlagents-lean works. @jrupert-unity Thank you so much