In the pursuit (2vs5), why can't step the actions like [2,2]? 

```
env = pursuit_v3.env(max_cycles=500, x_size=16, y_size=16, local_ratio=1.0, n_evaders=5,
n_pursuers=2,obs_range=7, n_catch=2, freeze_evaders=False, tag_reward=0.01,
catch_reward=5.0, urgency_reward=0.0, surround=True, constraint_window=1.0)
```
if the joint action is [2,2], how can I step it? 
I tried `env.step([2,2])`, but return `AssertionError: action is not in action space`
