Update app.py

app.py

@@ -100,7 +100,8 @@ def get_conversational_rag_chain(retriever_chain,llm):
 
     def safe_llm(input_str: str) -> str:
         if isinstance(input_str, langchain_core.prompts.chat.ChatPromptValue):
-            input_str = str(input_str)
+            # input_str = str(input_str)
+            input_str = input_str.to_messages()
 
         # Call the original llm, which should now work correctly
         return llm(input_str)