Hi Andrea_r
I tried “Network activate” and only “Activate.
In WPMU i had to include:
require_once(ABSPATH.'wp-includes/pluggable.php');
Because the following error occurred:
Fatal error: Call to undefined function wp_get_current_user() in C:\xampp\xampp\htdocs\merchandising\wp-includes\capabilities.php on line 1059
This is the only diference.