### Tell us what’s happening:

hi, can anyone help me? I don’t understand the command and how to fix my codes now?

### Your code so far

```
class TreeNode:
def __init__(self, key):
self.key = key
self.left = None
self.right = None
class BinarySearchTree:
def __init__(self):
self.root = None
# User Editable Region
def _insert(self, node, key):
if node is None:
return TreeNode(key)
if key < node.key:
left = self._insert(node.left, key)
# User Editable Region
```

### Your browser information:

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0`

### Challenge Information:

Learn Tree Traversal by Building a Binary Search Tree - Step 12