Drupal\Core\Form\EnforcedResponseException when installing any module

Hey there,

I've set up an installation of Drupal 8.0.0-beta12. The setup worked fine without any problem. But when I try to install any new module the following error shows up:

Drupal\Core\Form\EnforcedResponseException: in Drupal\Core\Form\FormBuilder->buildForm() (line 296 of core/lib/Drupal/Core/Form/FormBuilder.php).

Do you have any ideas on this?

Thank you!

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