Update app.py

app.py

@@ -42,7 +42,7 @@ def chat(message, history, openai_api_key):
         #set_assistant(create_assistant())
         set_assistant(load_assistant())
 
-    if get_thread == None or len(history) == 0:
+    if get_thread() == None or len(history) == 0:
         set_thread(create_thread())
         
     create_message(get_thread(), message)