So… you updated your WooCommerce shop to WordPress 4.4 and now you get that strange error message when trying to configure your WooCommerce attributes terms?
You are not allowed to manage these items.
Here is what it looks like in the WordPress dashboard:
Well, WooCommerce devs are aware of it, and it’s been fixed but not deployed yet. But until the next WooCommerce update, there’s a quick and easy workaround.
Simply open /wp-content/plugins/woocommerce/includes/class-wc-post-types.php and change line 187 from
'show_ui' => false,
'show_ui' => true,
That should solve the issue ;-)