I was trying to implement a basic hello world Lightning Web Component in the playground using this link in the component library - <https://gs0.lightning.force.com/docs/component-library/documentation/lwc/lwc.install_playground> but I keep getting this error and I have followed the steps exactly as stated. (copy-paste)

> 
> Unable to resolve c-hello-world from root/app
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/AT0gG.png)](https://i.stack.imgur.com/AT0gG.png)

Anybody else tried this yet?