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Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "custom_quantity_buttons_script" not found or invalid function name
in /home/tuttotuttomenome/public_html/wp-includes/class-wp-hook.php on line 324

Call stack:

  1. WP_Hook::apply_filters(NULL, array)
    wp-includes/class-wp-hook.php:348
  2. WP_Hook::do_action(array)
    wp-includes/plugin.php:517
  3. do_action('wp_footer')
    wp-includes/general-template.php:3080
  4. wp_footer()
    wp-content/themes/porto/footer.php:277
  5. require_once('/home/tuttotuttomeno...mes/porto/footer.php')
    wp-includes/template.php:810
  6. load_template('/home/tuttotuttomeno...mes/porto/footer.php', true, array)
    wp-includes/template.php:745
  7. locate_template(array, true, true, array)
    wp-includes/general-template.php:92
  8. get_footer()
    wp-content/themes/porto/index.php:170
  9. include('/home/tuttotuttomeno...emes/porto/index.php')
    wp-includes/template-loader.php:106
  10. require_once('/home/tuttotuttomeno.../template-loader.php')
    wp-blog-header.php:19
  11. require('/home/tuttotuttomeno...l/wp-blog-header.php')
    index.php:17

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