Update ChatEngine.py

ChatEngine.py

@@ -38,7 +38,7 @@ class ChatEngine:
         logging.info("Created Chat History")
         
         logging.info("Asking LLM")
-        response = llm.generate(chat_history, self.params)
+        response = llm.invoke(chat_history, self.params)
         
         logging.info("Got Response from LLM, Returning")
         return response