我正在嘗試從Google Research Football Environment安裝 python 模塊 gfootball 。按照 Mac 網(wǎng)站上顯示的安裝說明進行操作（我使用的是 macOS High Sierra (10.13.6) 和 Xcode 9.4），我使用以下內容測試了設置：# test_gfootball.pyimport gfootball.env as football_envenv = football_env.create_environment(env_name="academy_empty_goal_close")env.reset()env.close()但我收到以下錯誤：File "test_gfootball.py", line 5, in <module>    env = football_env.create_environment(env_name="academy_empty_goal_close")  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/env/__init__.py", line 182, in create_environment    scenario_config = config.Config({'level': env_name}).ScenarioConfig()  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/env/config.py", line 98, in __init__    self.NewScenario()  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/env/config.py", line 153, in NewScenario    self._scenario_cfg = scenario_builder.Scenario(self).ScenarioConfig()  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/env/scenario_builder.py", line 62, in __init__    scenario.build_scenario(self)  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/scenarios/academy_empty_goal_close.py", line 33, in build_scenario    builder.AddPlayer(-1.0, 0.0, e_PlayerRole_GK)  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/gfootball/env/scenario_builder.py", line 108, in AddPlayer    player = Player(x, y, role, lazy, controllable)TypeError: __init__() should return None, not 'NoneType'我已經(jīng)處理了錯誤消息中指定的文件，但據(jù)我所知，一切似乎都很好。我懷疑使用“env_name”的調用有問題 - 也許它找不到場景 - “academy_empty_goal_close.我還應該檢查什么才能發(fā)現(xiàn)問題？