Im using rappid for my current project.
Im trying to use ui.Popup for my element. But for i don't know why, the 'content' option is not available for me.
In the docs, it said it need the content option for the contents. https://resources.jointjs.com/docs/rappid/v3.4/ui.html#ui.Popup

But, when i press ctrl+space to see the available options, it doesnt have content. and if i add it manually, it just gives me error.
here's the picture, cant post picture coz its the first time i post a question: [https://i.ibb.co/nf6Zz1h/error.png][1]

Do i need to use other options that listed in the option? is the doc not updated?

Thanks!