E0605: An asset file isn't there

A web.Style or web.Script names a file (or a pattern) that matches nothing next to the declaring file. The message suggests the nearest file of its kind.

Wrong

@web.Live("/", web.Style("styles/ap.css"))
type Home struct{ ui.Live }

Right

@web.Live("/", web.Style("styles/app.css"))
type Home struct{ ui.Live }