V9.0.1 Error edit Express Object Block in Editmode

In a fresh C5 installation it’s not possible anymore to edit an expressobject-block in a page.
Inserting works, but edit block results in error:

Call to undefined method DoctrineProxies\__CG__\Concrete\Core\Entity\Express\Form::label()

Details

/concrete/blocks/express_entry_detail/edit.php(39): Error->null	
/concrete/src/Block/View/BlockView.php(269): null->include	
/concrete/src/View/AbstractView.php(164): Concrete\Core\Block\View\BlockView->renderViewContents	
/concrete/views/dialogs/block/edit.php(33): Concrete\Core\View\AbstractView->render	
/concrete/src/View/View.php(295): null->include	
/concrete/src/View/View.php(273): Concrete\Core\View\View->renderInnerContents	
/concrete/src/View/DialogView.php(34): Concrete\Core\View\View->renderViewContents	
/concrete/src/View/AbstractView.php(164): Concrete\Core\View\DialogView->renderViewContents	
/concrete/src/Routing/ControllerRouteAction.php(82): Concrete\Core\View\AbstractView->render	
/concrete/src/Http/RouteDispatcher.php(37): Concrete\Core\Routing\ControllerRouteAction->execute	
/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\RouteDispatcher->dispatch	
/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\DispatcherDelegate->next	
/concrete/src/Http/DefaultDispatcher.php(127): Concrete\Core\Http\Middleware\MiddlewareStack->process	
/concrete/src/Http/DefaultDispatcher.php(60): Concrete\Core\Http\DefaultDispatcher->handleDispatch	
/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\DefaultDispatcher->dispatch	
/concrete/src/Http/Middleware/FrameOptionsMiddleware.php(39): Concrete\Core\Http\Middleware\DispatcherDelegate->next	
/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\FrameOptionsMiddleware->process	
/concrete/src/Http/Middleware/StrictTransportSecurityMiddleware.php(36): Concrete\Core\Http\Middleware\MiddlewareDelegate->next	
/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\StrictTransportSecurityMiddleware->process	
/concrete/src/Http/Middleware/ContentSecurityPolicyMiddleware.php(36): Concrete\Core\Http\Middleware\MiddlewareDelegate->next	
/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ContentSecurityPolicyMiddleware->process	
/concrete/src/Http/Middleware/CookieMiddleware.php(35): Concrete\Core\Http\Middleware\MiddlewareDelegate->next	
/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\CookieMiddleware->process	
/concrete/src/Http/Middleware/ApplicationMiddleware.php(29): Concrete\Core\Http\Middleware\MiddlewareDelegate->next	
/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ApplicationMiddleware->process	
/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\MiddlewareDelegate->next	
/concrete/src/Http/DefaultServer.php(85): Concrete\Core\Http\Middleware\MiddlewareStack->process	
/concrete/src/Foundation/Runtime/Run/DefaultRunner.php(125): Concrete\Core\Http\DefaultServer->handleRequest	
/concrete/src/Foundation/Runtime/DefaultRuntime.php(102): Concrete\Core\Foundation\Runtime\Run\DefaultRunner->run	
/concrete/dispatcher.php(45): Concrete\Core\Foundation\Runtime\DefaultRuntime->run	
/index.php(2): null->require