Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Package\PackageManager" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Composer/PackageArtifactBuilder.php:54 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-core/Classes/Composer/PackageArtifactBuilder.php on line 54