We created something with which we can post a post on multiple blogs in a certain category. (WPMU) Now I want to use the function wp_set_object_terms to add the category to it, but it returns an error.
I do the following:
wp_set_object_terms( $post_id, array('categgory-to-add'), 'category'))
I have switched to the correct blog, I add the correct post_id and I add an array with the category names and I want to add a category.
It returns the following error:
wp_error Object ( [errors] => Array ( [invalid_taxonomy] => Array (  => Invalid Taxonomy ) ) [error_data] => Array ( ) )
invalid taxonomy, I have tried it as well with 'post_tag' or any other random name and none of them work.
Anyone can help?