Fatal error: Could not check compatibility between TYPO3\CMS\Core\Package\PackageManager::injectClassLoader(TYPO3\CMS\Core\Core\ClassLoader $classLoader) and TYPO3\Flow\Package\PackageManager::injectClassLoader(TYPO3\Flow\Core\ClassLoader $classLoader), because class TYPO3\Flow\Core\ClassLoader is not available in /home/.sites/69/site1307/web/typo3/sysext/core/Classes/Package/PackageManager.php on line 96