Update app.py

app.py

@@ -34,7 +34,7 @@ class ChatWrapper:
     def __init__(self):
         self.lock = Lock()
     def __call__(
-        self, api_key: str, inp: str, history: Optional[Tuple[str, str]], chain: Optional[ConversationChain]
+        self, api_key: str, inp: str, history: Optional[Tuple[str, str]], chain: Optional[create_pandas_dataframe_agent]
     ):
         """Execute the chat functionality."""
         self.lock.acquire()