Conflict with Smart slider

  • Warning: Cannot modify header information – headers already sent by (output started at /homepages/26/d810120367/htdocs/site/wp-includes/functions.php:4552) in /homepages/26/d810120367/htdocs/site/wp-content/plugins/smart-slider-3/nextend/library/libraries/mvc/controllers/backend.php on line 7

    This is the message i got inthe admin.
    I do some research, when i erase this “add_action(‘admin_notices’, ‘hmac_admin_notice’);” from the wc-etransactions.php it works fine.

    How can i make it work ?
    What is the purpose of this : “add_action(‘admin_notices’, ‘hmac_admin_notice’);” ?

    Thanks a lot !

    The page I need help with: [log in to see the link]

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