Http proxy error while testing frappe UI

I made a custom app in frappe and i want to use frappe UI in it
followed these steps for frappe UI installation as per https://frappeui.com/story/docs-getting-started-story-js

npx degit netchampfaris/frappe-ui-starter frontend
cd frontend
yarn
yarn dev

got this in localhost:8080

when i clicked on ‘click to send ping request’ the promise is pending and following error in bench

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