• After the latest update to 4.0.1 I get the following error message when publishing a custom post type:

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘s2_post_updated_send_email’ not found or invalid function name in /…/wp-includes/plugin.php on line 496

    Warning: Cannot modify header information – headers already sent by (output started at /…/wp-includes/plugin.php:496) in /…/wp-admin/post.php on line 233

    Warning: Cannot modify header information – headers already sent by (output started at /…/wp-includes/plugin.php:496) in /…/wp-includes/pluggable.php on line 1178

    Please help!

    https://wordpress.org/plugins/register-plus-redux/

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