Update app.py

app.py

@@ -234,7 +234,7 @@ with gr.Blocks() as demo:
         upvote_btn_b.click(vote_down_model, inputs=[state, chatbot1, chatbot2], outputs=[chatbot1, chatbot2, upvote_btn_a, upvote_btn_b, textbox, submit_btn])
     with gr.Tab("Leaderboard"):
         try:
-            leaderboard = gr.Dataframe(refresh_leaderboard(collection))
+            leaderboard = gr.Dataframe(refresh_leaderboard())
         except:
             leaderboard = gr.Dataframe()
         refresh_btn = gr.Button("Refresh Leaderboard")