Autoloading should be used instead!

[HMJR]

Below the error log after upgrading to Release 2023-04-04 "Jack Jackrum" (template Writr)
2023-04-20 08:13:02require(action.php) is deprecated. It was called from require() in /storage/////lib/plugins/keywords/action.php:18 Autoloading should be used instead!
2023-04-20 08:13:02require(action.php) is deprecated. It was called from require() in /storage/////lib/plugins/keywords/action.php:18 Autoloading should be used instead!
2023-04-20 08:13:02require(action.php) is deprecated. It was called from require() in /storage/////lib/plugins/keywords/action.php:18 Autoloading should be used instead!
2023-04-20 08:13:03require(action.php) is deprecated. It was called from require() in /storage/////lib/plugins/keywords/action.php:18 Autoloading should be used instead!
2023-04-20 08:13:03require(syntax.php) is deprecated. It was called from require() in /storage/////lib/plugins/keywords/syntax/keywords.php:15 Autoloading should be used instead!

Thanks for an explanation and tips.

Henk M.