执行our_plane=OurPlane(screen)这行代码出错

执行 our_plane=OurPlane(screen)这行代码出错,其中screen是屏幕对象，是这样实例化的screen = pygame.display.set_mode((width, height)),错误提示如下：

Traceback (most recent call last):
  File "C:/Users/fubai/PycharmProjects/飞机大战作业[v0.1]/main.py", line 44, in <module>
    our_plane=OurPlane(screen)
  File "C:\Users\fubai\PycharmProjects\飞机大战作业[v0.1]\venv\lib\site-packages\pygame\sprite.py", line 124, in __init__
    self.add(*groups)
  File "C:\Users\fubai\PycharmProjects\飞机大战作业[v0.1]\venv\lib\site-packages\pygame\sprite.py", line 142, in add
    self.add(*group)
TypeError: add() argument after * must be an iterable, not pygame.Surface

怎么传入的参数要是一个迭代，而不是Surface,请问老师该如何解决？谢谢!