Python参数奇怪的不匹配

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在测试一些代码时，出现错误：

TypeError：breadth_first_search（）接受2到3个位置参数，但给出了4个

函数声明的参数位如下所示：

def breadth_first_search(self, id: int, level=None)

呼叫看起来像这样：

tree.breadth_first_search(parent_id)

据我所知，这应该是正确的。我不知道为什么它将我的一个论点（或两个论点，包括自我）解释为四个。我缺少什么东西吗？

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为了完整起见，这是回溯：

Traceback (most recent call last):
  File "test.py", line 4, in <module>
    tree = FeatureQuery.load_feature_tree("general", inventory)
  File "D:\Speechcraft\Python\core\ling_query.py", line 201, in load_feature_tree
    FeatureQuery.load_feature_node_recursive(feature_inventory, tree, results, l)
  File "D:\Speechcraft\Python\core\ling_query.py", line 221, in load_feature_node_recursive
    parent = tree.breadth_first_search(parent_id)
  File "D:\Speechcraft\Python\core\phonological_units.py", line 37, in breadth_first_search
    return self.breadth_first_search(self, id, next_level)
TypeError: breadth_first_search() takes from 2 to 3 positional arguments but 4 were given