Update app.py

app.py

@@ -123,7 +123,7 @@ container = st.container()
 
 @st.cache_resource
 def query(payload):
-    for output in graph.stream([HumanMessage(content=payload], config=config):
+    for output in graph.stream([HumanMessage(content=payload)], config=config):
       if "__end__" in output:
           continue
       # stream() yields dictionaries with output keyed by node name