How to add custom social icons to Enfold options

Hello good Morning
How can I add an icon that does not come in the theme in the header?

I am using the code that comes in the documentation but I get an error when I put it, the fontello zip file is already imported

This is the code I am using:

// Register new icon as a theme icon

function avia_add_custom_icon($icons) {
$icons[‘tiktok’] = array( ‘font’ =>’tiktok’, ‘icon’ => ‘ue801’);
return $icons;
}
add_filter(‘avf_default_icons’,’avia_add_custom_icon’, 10, 1);

// Add new icon as an option for social icons

function avia_add_custom_social_icon($icons) {
$icons[‘tiktok’] = ‘tiktok’;
return $icons;
}
add_filter(‘avf_social_icons_options’,’avia_add_custom_social_icon’, 10, 1);