why SplunkUI doesn't render component in browser?

Splunk Enterprise

Hi!
I found a bug in SplunkUI documentation: after installing the test component, the visualization is not displayed. After the command "yarn run start:demo" the compilation succeeds, but the url localhost:8080 does not display anything. Any idea why the visual isn't loading?
Documentation page: https://splunkui.splunk.com/Create/ComponentTutorial

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