Hi, first of all congrats for the plugin!
I’m using it and when I’ve migrated the site to another serve I got this error, never show before.
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘custom_thumb_size’ not found or invalid function name in /homepages/38/d423326171/htdocs/xxxxxxx/wp-includes/class-wp-hook.php on line 298
Any help please? Thank you very much!
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