ImportError: cannot import name 'SpawnPeds'

[xzy0825]

When I tried to python rl_agent/scripts/train_scripts/train_ppo.py
It had error here:

Traceback (most recent call last): File "rl_agent/scripts/train_scripts/train_ppo.py", line 13, in from rl_agent.env_wrapper.ros_env_cont_img import RosEnvContImg File "/home/hantewin/test/src/drl_local_planner_ros_stable_baselines-master/rl_agent/src/rl_agent/env_wrapper/ros_env_cont_img.py", line 19, in from rl_agent.env_wrapper.ros_env_img import RosEnvImg File "/home/hantewin/test/src/drl_local_planner_ros_stable_baselines-master/rl_agent/src/rl_agent/env_wrapper/ros_env_img.py", line 15, in from rl_agent.env_wrapper.ros_env import RosEnvAbs File "/home/hantewin/test/src/drl_local_planner_ros_stable_baselines-master/rl_agent/src/rl_agent/env_wrapper/ros_env.py", line 32, in from rl_agent.env_utils.task_generator import TaskGenerator File "/home/hantewin/test/src/drl_local_planner_ros_stable_baselines-master/rl_agent/src/rl_agent/env_utils/task_generator.py", line 29, in from pedsim_srvs.srv import SpawnPeds ImportError: cannot import name 'SpawnPeds'