Designer online SPA demo

I have tried the designer online, according to the example (, but I have got the following error, and it doesn't show me anything, I just suspect that I should redirect port 8000 to 5000, how can I do this?

core.js:15724 ERROR Error: Uncaught (in promise): Error: Cannot match any routes. URL Segment: 'WebReportDesigner/index.html'

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Rich Text Editor. To edit a paragraph's style, hit tab to get to the paragraph menu. From there you will be able to pick one style. Nothing defaults to paragraph. An inline formatting menu will show up when you select text. Hit tab to get into that menu. Some elements, such as rich link embeds, images, loading indicators, and error messages may get inserted into the editor. You may navigate to these using the arrow keys inside of the editor and delete them with the delete or backspace key.