Install c57 a -- Failed

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Hey Folks,
i can't install the new c57 Version, with this Error-Message:

Argument 1 passed to Concrete\Core\Permission\Access\Access::create() must be an instance of PermissionKey, instance of Concrete\Core\Permission\Key\AddBlockBlockTypeKey given, called in /xxx/xxx/xxx/xxxx/xx.xxxx/concrete5-5.7.0/web/concrete/core/Backup/ContentImporter.php on line 639 and defined

Has anybody an Idea …
?

Thanks

noviomagus