Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

core/modules/block_content/config/install/core.entity_view_mode.block_content.full.yml

@@ -1,8 +1,9 @@
-id: block_content.full
-label: Full
+langcode: en
 status: false
-cache: true
-targetEntityType: block_content
 dependencies:
   module:
     - block_content
+id: block_content.full
+label: Full
+targetEntityType: block_content
+cache: true

core/modules/block_content/config/install/field.storage.block_content.body.yml

@@ -15,3 +15,4 @@ cardinality: 1
 translatable: true
 indexes: {  }
 persist_with_no_fields: true
+custom_storage: false