Update app.py

fix the prompt

app.py

@@ -293,7 +293,7 @@ if st.session_state.get('is_key_valid', False):
     Question: {input}
     Thought:{agent_scratchpad}"""
 
-    prompt = PromptTemplate.from_template(template)
+    prompt = ChatPromptTemplate.from_template(template)
     agent_executor = AgentExecutor(agent=agent, tools=tools, verbose=True, return_intermediate_steps=True)
 
     col1, col2 = st.columns([1, 2])