Any suspects about that? Log isn’t clear to know what is going on…
There might be something wrong with the regions in your page or layout HTML.
Check if in the page (with Preview) there is an HTML element with attribute
data-portal-region="..." and directly inside another element with
data-portal-region="..." (instead of a component with
The part and layout HTML need to have a single HTML element as root. Try wrapping your layout HTML with a
<div> for example.