Update chain_app.py

chain_app.py

@@ -1239,7 +1239,7 @@ async def main(message: cl.Message):
 
     elif chat_profile == 'gemma2-9B':
         completion = groq_client.chat.completions.create(
-            model="gemma-9b-it",
+            model="gemma2-9b-it",
             messages=[
                 {
                     "role": "user",