Update multi_agent.py

multi_agent.py

@@ -1,4 +1,4 @@
-import base64, os
+import base64, json, os
 
 from autogen import ConversableAgent, AssistantAgent
 from autogen.coding import LocalCommandLineCodeExecutor
@@ -51,8 +51,10 @@ def run_multi_agent(llm, message):
     )
 
     chat_history = ""
-    
-    for message in chat_history.messages:
+
+    chat_json = json.loads(chat_history_str)
+        
+    for message in chat_json["messages"]:
         chat_history += f"Role: {message['role']}, Content: {message['content']}\n"
     
     image_data = read_image_file("/home/user/app/coding/ytd_stock_gains.png")