TYPO3.Setup

I downloaded and installed Typo3 Flow Base (git://git.typo3.org/TYPO3v5/Distributions/Base.git), set the rights and ran '/setup'. After the admin user creation step I get the following error message when I proceed:

Warning: class_implements() [<a href='function.class-implements'>function.class-implements</a>]: Class string does not exist and could not be loaded in /srv/htdocs/team/simon/sandbox/typo3-neos/Packages/Framework/TYPO3.Flow/Classes/TYPO3/Flow/Utility/TypeHandling.php line 128
29 TYPO3\Flow\Error\ErrorHandler::handleError(2, "class_implements() [&lt;a href='function.class-implem…lass string does not exist and could not be loaded", "/srv/htdocs/team/simon/sandbox/typo3-neos/Packages…3.Flow/Classes/TYPO3/Flow/Utility/TypeHandling.php", 128, array|2|)

28 class_implements("string")

27 TYPO3\Flow\Utility\TypeHandling::isCollectionType("string")

26 TYPO3\Flow\Validation\ValidatorResolver_Original::buildBaseValidatorConjunction("TYPO3\Party\Domain\Model\PersonName##Persistence##Default", "TYPO3\Party\Domain\Model\PersonName", array|2|)

25 TYPO3\Flow\Validation\ValidatorResolver_Original::getBaseValidatorConjunction("TYPO3\Party\Domain\Model\PersonName", array|2|)

24 TYPO3\Flow\Validation\ValidatorResolver_Original::buildBaseValidatorConjunction("TYPO3\Neos\Domain\Model\User##Persistence##Default", "TYPO3\Neos\Domain\Model\User", array|2|)

23 TYPO3\Flow\Validation\ValidatorResolver_Original::getBaseValidatorConjunction("TYPO3\Neos\Domain\Model\User", array|2|)

22 TYPO3\Flow\Persistence\Doctrine\PersistenceManager_Original::validateObject(TYPO3\Neos\Domain\Model\User, SplObjectStorage)

21 TYPO3\Flow\Persistence\Doctrine\PersistenceManager_Original::onFlush(Doctrine\ORM\Event\OnFlushEventArgs)

20 Doctrine\Common\EventManager::dispatchEvent("onFlush", Doctrine\ORM\Event\OnFlushEventArgs)

19 Doctrine\ORM\UnitOfWork::commit(NULL)

18 Doctrine\ORM\EntityManager::flush()

17 TYPO3\Flow\Persistence\Doctrine\PersistenceManager_Original::persistAll(TYPO3\Flow\Mvc\ActionRequest, TYPO3\Flow\Http\Response, TYPO3\Setup\Controller\SetupController, "TYPO3\Flow\Mvc\Dispatcher::afterControllerInvocation")

16 call_user_func_array(array|2|, array|4|)

15 TYPO3\Flow\SignalSlot\Dispatcher::dispatch("TYPO3\Flow\Mvc\Dispatcher", "afterControllerInvocation", array|3|)

14 TYPO3\Flow\SignalSlot\SignalAspect_Original::forwardSignalToDispatcher(TYPO3\Flow\Aop\JoinPoint)

13 TYPO3\Flow\Aop\Advice\AbstractAdvice::invoke(TYPO3\Flow\Aop\JoinPoint)

12 TYPO3\Flow\Mvc\Dispatcher::emitAfterControllerInvocation(TYPO3\Flow\Mvc\ActionRequest, TYPO3\Flow\Http\Response, TYPO3\Setup\Controller\SetupController)

11 TYPO3\Flow\Mvc\Dispatcher_Original::dispatch(TYPO3\Flow\Mvc\ActionRequest, TYPO3\Flow\Http\Response)

10 TYPO3\Flow\Mvc\Dispatcher::dispatch(TYPO3\Flow\Mvc\ActionRequest, TYPO3\Flow\Http\Response)

9 call_user_func_array(array|2|, array|2|)

8 TYPO3\Flow\Mvc\Dispatcher::Flow_Aop_Proxy_invokeJoinPoint(TYPO3\Flow\Aop\JoinPoint)

7 TYPO3\Flow\Aop\Advice\AdviceChain::proceed(TYPO3\Flow\Aop\JoinPoint)

6 TYPO3\Flow\Security\Aspect\RequestDispatchingAspect_Original::blockIllegalRequestsAndForwardToAuthenticationEntryPoints(TYPO3\Flow\Aop\JoinPoint)

5 TYPO3\Flow\Aop\Advice\AroundAdvice::invoke(TYPO3\Flow\Aop\JoinPoint)

4 TYPO3\Flow\Aop\Advice\AdviceChain::proceed(TYPO3\Flow\Aop\JoinPoint)

3 TYPO3\Flow\Mvc\Dispatcher::dispatch(TYPO3\Flow\Mvc\ActionRequest, TYPO3\Flow\Http\Response)

2 TYPO3\Setup\Core\RequestHandler::handleRequest()

1 TYPO3\Flow\Core\Bootstrap::run()