I detected the RestUI Manager use EntityManagerWrapper class directly instead of use the EntityManagerInterface. The current implementation also have a conflict if you try to use the module Webprofiler

The error message related is similar like this

Recoverable fatal error: Argument 1 passed to Drupal\restui\RestUIManager::__construct() must be an instance of Drupal\Core\Entity\EntityManager, instance of Drupal\webprofiler\Entity\EntityManagerWrapper given, called in /Users/enzo/www/drupal8beta16/core/lib/Drupal/Component/DependencyInjection/Container.php on line 265 and defined in Drupal\restui\RestUIManager->__construct() (line 34 of /Users/enzo/www/drupal8beta16/modules/contrib/restui/src/RestUIManager.php).
CommentFileSizeAuthor
#2 replace-2579477-2.patch627 bytes-enzo-
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-enzo- created an issue. See original summary.

-enzo-’s picture

-enzo- CreditAttribution: -enzo- at Anexus commented
FileSize
replace-2579477-2.patch627 bytes

did a patch to resolve future problems and use the EntityManager Interface