Error after last plugin update

Dear Support

After updating the coming soon plugin i got following error message visible when visiting the the site.

Notice: Constant FS_METHOD already defined in /wp-config.php on line 96 Warning: Cannot modify header information – headers already sent by (output started at /wp-config.php:96) in WordPress_01/wp-includes/functions.php on line 6221 Warning: Cannot modify header information – headers already sent by (output started at WordPress_01/wp-config.php:96) in WordPress_01/wp-admin/includes/misc.php on line 1282 Warning: Cannot modify header information – headers already sent by (output started at WordPress_01/wp-config.php:96) in WordPress_01/wp-includes/pluggable.php on line 1281 Warning: Cannot modify header information – headers already sent by (output started at WordPress_01/wp-config.php:96) in WordPress_01/wp-includes/pluggable.php on line 1284 Warning: Cannot modify header information – headers already sent by (output started at WordPress_01/wp-config.php:96) in WordPress_01/wp-includes/pluggable.php on line 1281 Warning: Cannot modify header information – headers already sent by (output started at WordPress_01/wp-config.php:96) in WordPress_01/wp-includes/pluggable.php on line 1284

can you relate to this?

Thanks