PHP error when upgrading 4.7.16 -> 4.7.17

[Bot]

Hi,

how to fix this?

4.7.16 -> 4.7.17

PHP 8.1 in use.

"We were unable to start a PHP session. You will need to contact your host to adjust your PHP configuration before you can continue. The error reported was: Return type of IPS\_DateTime::format($format, $memberOrLanguage = null) should either be compatible with DateTime::format(string $format): string, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice"

View the full Question