Fix typo in main.py

main.py

@@ -11,11 +11,11 @@ def predict(message, history):
         history_langchain_format.append(AIMessage(content=ai))
     history_langchain_format.append(HumanMessage(content=message))
     try:
-        caht_response = llm.invoke(history_langchain_format)
-    except Exception as e:
-        caht_response = "Error: " + str(e)
+        chat_response = llm.invoke(history_langchain_format)
+    except chat_response as e:
+        chat_response = "Error: " + str(e)
         
-    return caht_response
+    return chat_response
 
 def run():
     demo = gr.ChatInterface(predict)