dash-core-components
                                
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I run plotly dash in Ubuntu 20.04. I meet this issue, why? how can I fix it?

The first time the page loads is normal, an error occurs after the refresh
I haven't seen these issues before - any messages on the server side when this happens? You can get more info on that side if you use app.run_server(dev_tools_silence_routes_logging=False)