fix missing arg

app.py

@@ -177,7 +177,7 @@ with gr.Blocks() as demo:
 
     # Turn off interactivity while generating if you hit enter
     txt_msg = txt.submit(add_text, [chatbot, txt], [chatbot, txt], queue=False).then(
-            bot, [chatbot, model_name,
+            bot, [chatbot, model_name, oepnai_api_key,
                   reranker_enabled,reranker_kind,num_prerank_docs,
             num_docs, emb_model_kind, sub_vector_size, chunk_size, splitter_type
             ], [chatbot, prompt_html])