PHP errors for PHP 7.4

Hi Kriesi team,
my client’s website is running the latest version of Enfold. Trying to update to php 7.4 at United Domains leads to a rather long list of PHP errors.

Since I am not familiar with editing -php files, what would be best to do?

Fot now, the website is back on php 7.1

Thank you so much!

Kind regards,
Meike

Warning: Use of undefined constant minor – assumed ‘minor’ (this will throw an Error in a future version of PHP) in /homepages/41/d4295008937/htdocs/wirksam/wp-config.php on line 92

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-login.php on line 496

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-login.php on line 512

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/functions.php on line 6029

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-admin/includes/misc.php on line 1252

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 961

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 962

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 963

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 964

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 965

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 966

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 969

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 970

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 973

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 974

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 975

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 976

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 979

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 980

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 981

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 982

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 985

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 1265

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/d4295008937/htdocs/wirksam/wp-config.php:92) in /homepages/41/d4295008937/htdocs/wirksam/wp-includes/pluggable.php on line 1268