Update app.py

app.py

@@ -186,7 +186,7 @@ def invoke(openai_api_key, rag_option, prompt):
             completion, chain = llm_chain(llm, prompt)
             if (completion.generations[0] != None and completion.generations[0][0] != None):
                 result = completion.generations[0][0].text
-                llm_output = completion.generations[0][0].llm_output
+                llm_output = completion.generations[0].llm_output
     except Exception as e:
         err_msg = e
         raise gr.Error(e)