get rid of concurrency_limit

app.py

@@ -428,8 +428,7 @@ with gr.Blocks(css=css) as demo:
             caption,
             retry_btn,
             result
-        ],
-        concurrency_limit = 4
+        ]
     )
 
 demo.queue(max_size=16).launch(show_api=False, show_error=True)