PHP script '/home/mactcphp/www.mac-port.de/source/modules/d3/modcfg/Application/Model/d3database.php' is protected by SourceGuardian and requires a SourceGuardian loader 'ixed.8.1.lin' to be installed.

1) Download the required loader 'ixed.8.1.lin' from the SourceGuardian site: https://www.sourceguardian.com/loaders/download.php?php_v=8.1.29&php_ts=0&php_is=8&os_s=Linux&os_r=5.10.187%2B1-ph&os_m=x86_64
2) Install the loader to /usr/local/php8.1/lib/php/extensions/no-debug-non-zts-20210902
3) Edit 
 and add 'extension=ixed.8.1.lin' directive