when I execute：python3 src/main.py--config=comix--env config=particle with env_args.scenario=simple_ tag_coop t_max=1000000，An error occurred：“/home/hp/wendang/multiagent particle envs master/multiagent particle envs master/multiagent/core.py”， line 210, in apply_action_force：
p_force[i]=（agent.mass*agent.accel if agent.accel not None-else agent.mass）*agent.action.u+noise
AttributeError:'numpy.ndarray' object has no attribute'u'
when I execute：python3 src/main.py--config=comix--env config=particle with env_args.scenario=simple_ tag_coop t_max=1000000，An error occurred：“/home/hp/wendang/multiagent particle envs master/multiagent particle envs master/multiagent/core.py”， line 210, in apply_action_force：
p_force[i]=（agent.mass*agent.accel if agent.accel not None-else agent.mass）*agent.action.u+noise
AttributeError:'numpy.ndarray' object has no attribute'u'