Error in pluggable.php on line 1340 and 1343

Hello,

I got with the WP Version 5.8.2 the following error if I go to Admin Panel and want to view all appointment. Do you have any suggestions how I can fix it?
I know it’s not official compatible…

Warning: Cannot modify header information – headers already sent by (output started at /www/htdocs/***/****/wp-admin/includes/template.php:2532) in /www/htdocs/***/****/wp-includes/pluggable.php on line 1340

Warning: Cannot modify header information – headers already sent by (output started at /www/htdocs/***/****/wp-admin/includes/template.php:2532) in /www/htdocs/***/***/wp-includes/pluggable.php on line 1343

Thanks!

• This topic was modified 2 years, 12 months ago by breaked.