"Only CSS syntax is supported" error

[navmed]

I've selected some CSS:

.dialog-background>.dialog .row {
	padding-top: 12px;
}

And I try to convert from CSS to Stylus, but I get the error: Only CSS syntax is supported

I tried it on a few different blocks, but I always get the error. The file is a vue file with .vue extension.

[eybarta]

So I'm guessing this extension is not being maintained?
just got the same error... any help?