Error feeding the Page auto complet field

[Sten]

I have a page events whose template includes a repeater field event that contains a Page auto complete field tags that is fed by a repeater field called event_categories in the page Categories (template:  Categories) that contains a text field called event_category (template:  Category).

In the settings of the Page auto complete field tags I tried as template categories and category with the field event_category. In both cases, I can't load the tag of the right category.

Thank you