Replace in the code subcategory by subcategories
Or adapt requirements on content types configuration as it says :
1- A category content type with a bare minimum of a name short text/symbol field and a subcategories multi-reference field; you certainly can have any other fields you want.
Replace in the code
subcategorybysubcategoriesOr adapt requirements on content types configuration as it says :
1- A category content type with a bare minimum of a
nameshort text/symbol field and asubcategoriesmulti-reference field; you certainly can have any other fields you want.