Fatal error: Uncaught Error: Class 'OxidEsales\ComposerPlugin\Installer\Package\AbstractPackageInstaller' not found in /www/shop/vendor/oxid-esales/oxideshop-composer-plugin/src/Installer/Package/ThemePackageInstaller.php:19 Stack trace: #0 {main} thrown in /www/shop/vendor/oxid-esales/oxideshop-composer-plugin/src/Installer/Package/ThemePackageInstaller.php on line 19