TYPO3 Core

When activating an extension with a dependency on a not activated but downloaded extension, I get the following exception in 6.2beta4:

Fatal error: Class 'TYPO3\Flow\Package\Exception\InvalidPackageStateException' not found in /path/typo3_src/typo3/sysext/core/Resources/PHP/TYPO3.Flow/Classes/TYPO3/Flow/Package/PackageManager.php on line 382
Call Stack
#    Time    Memory    Function    Location
1    0.0001    681352    {main}( )    ../mod.php:0
2    0.1684    12874832    TYPO3\CMS\Extbase\Core\ModuleRunner->callModule( )    ../mod.php:47
3    0.1697    12901240    TYPO3\CMS\Extbase\Core\Bootstrap->run( )    ../ModuleRunner.php:81
4    0.4199    17277288    TYPO3\CMS\Extbase\Core\Bootstrap->handleRequest( )    ../Bootstrap.php:197
5    0.4349    17489496    TYPO3\CMS\Extbase\Mvc\Web\BackendRequestHandler->handleRequest( )    ../Bootstrap.php:208
6    0.4403    17681584    TYPO3\CMS\Extbase\Mvc\Dispatcher->dispatch( )    ../BackendRequestHandler.php:47
7    0.4911    18983072    TYPO3\CMS\Extbase\Mvc\Controller\ActionController->processRequest( )    ../Dispatcher.php:83
8    0.5764    20229784    TYPO3\CMS\Extbase\Mvc\Controller\ActionController->callActionMethod( )    ../ActionController.php:171
9    0.5767    20235688    call_user_func_array ( )    ../ActionController.php:300
10    0.5767    20236376    TYPO3\CMS\Extensionmanager\Controller\ActionController->toggleExtensionInstallationStateAction( )    ../ActionController.php:300
11    0.5942    20535376    TYPO3\CMS\Extensionmanager\Service\ExtensionManagementService->resolveDependenciesAndInstall( )    ../ActionController.php:78
12    0.6017    20659848    TYPO3\CMS\Extensionmanager\Service\ExtensionManagementService->installDependencies( )    ../ExtensionManagementService.php:138
13    1.3395    22031576    TYPO3\CMS\Extensionmanager\Utility\InstallUtility->install( )    ../ExtensionManagementService.php:202
14    1.3482    22046000    TYPO3\CMS\Extensionmanager\Utility\InstallUtility->loadExtension( )    ../InstallUtility.php:120
15    1.3482    22046000    TYPO3\CMS\Core\Package\PackageManager->activatePackage( )    ../InstallUtility.php:170
16    1.3483    22046000    TYPO3\Flow\Package\PackageManager->activatePackage( )    ../PackageManager.php:535
17    1.3483    22046176    TYPO3\Flow\Package\PackageManager->sortAndSavePackageStates( )    ../PackageManager.php:542
18    1.3483    22046176    TYPO3\CMS\Core\Package\PackageManager->sortAvailablePackagesByDependencies( )    ../PackageManager.php:914
19    1.3483    22047040    TYPO3\CMS\Core\Package\PackageManager->getAvailablePackageLoadingOrder( )    ../PackageManager.php:776
20    1.3483    22047040    TYPO3\CMS\Core\Package\PackageManager->buildDependencyGraph( )    ../PackageManager.php:719
21    1.3483    22047040    TYPO3\CMS\Core\Package\PackageManager->resolvePackageDependencies( )    ../PackageManager.php:684
22    1.3517    22091544    TYPO3\Flow\Package\PackageManager->getDependencyArrayForPackage( )    ../PackageManager.php:800
23    1.3517    22092568    TYPO3\Flow\Package\Package->getPackageMetaData( )    ../PackageManager.php:979
24    1.3519    22094600    TYPO3\CMS\Core\Package\PackageManager->getPackageKeyFromComposerName( )    ../Package.php:155
25    1.3519    22094600    TYPO3\Flow\Package\PackageManager->getPackageKeyFromComposerName( )    ../PackageManager.php:451

The dependent extension is activated nevertheless.

A file ./typo3/sysext/core/Resources/PHP/TYPO3.Flow/Classes/TYPO3/Flow/Package/Exception/InvalidPackageStateException.php exists and contains the class.

When re-loading the extension manager, I can see the dependent extension activated and can now activate the extension I tried at first.