Picture slots aren't working, throwing a message instead

Using slots as described here -> https://vuedose.tips/use-responsive-images-with-v-lazy-image#picture throws this message:

(...args) => {
// If a user calls a compiled slot inside a template expression (#1745), it
// can mess up block tracking, so by default we disable block tracking and
// force bail out when invoking a compiled slot (indicated by the ._d flag).
// This isn't necessary if rendering a compiled ``, so we flip the
// ._d flag off when invoking the wrapped fn inside `renderSlot`.
if (renderFnWithContext._d) {
setBlockTracking(-1);
}
const prevInstance = setCurrentRenderingInstance(ctx);
const res = fn(...args);
setCurrentRenderingInstance(prevInstance);
if (renderFnWithContext._d) {
setBlockTracking(1);
}
if (true) {
devtoolsComponentUpdated(ctx);
}
return res;
}