Fix submit error

evaluate.py

@@ -111,7 +111,7 @@ def submit_data(predictions_file: str,
     
 
     # check the last time the user submitted
-    data = fetch_dataset_df()
+    data, __ = fetch_dataset_df()
     if not data[data['user'] == user_state].empty:
         last_time = data[data['user'] == user_state]['submission time'].max()
         delta = datetime.datetime.now(datetime.timezone.utc) - last_time.to_pydatetime()