Try `raise gr.Error()`

app.py

@@ -61,6 +61,7 @@ def process_submission(*inputs):
         
         gr.Info('Submission valid, running tournament...')
 
+        raise gr.Error("It's a try...")
         leaderboard_server.prepare_model_for_submission(inputs["submission_file"], metadata)
     except ValueError as err:
         gr.Warning(str(err))