diff --git a/core/lib/Drupal/Core/Config/Schema/Element.php b/core/lib/Drupal/Core/Config/Schema/Element.php
index c492d42..6f4fe9d 100644
--- a/core/lib/Drupal/Core/Config/Schema/Element.php
+++ b/core/lib/Drupal/Core/Config/Schema/Element.php
@@ -22,6 +22,13 @@
   protected $value;
 
   /**
+   * The parent element object.
+   *
+   * @var Element
+   */
+  protected $parent;
+
+  /**
    * Create typed config object.
    */
   protected function parseElement($key, $data, $definition) {
@@ -37,4 +44,23 @@ protected function buildDataDefinition($definition, $value, $key) {
     return  \Drupal::service('config.typed')->buildDataDefinition($definition, $value, $key, $this);
   }
 
+  /**
+   * Get the full config path of the element.
+   *
+   * @return string
+   *   The full config path of the element starting with the top element key
+   *   followed by a colon followed by element names separated with dots.
+   *   For example: views.view.content:display.default.display_options.
+   */
+  public function getFullName() {
+    if (isset($this->parent)) {
+      // Ensure if the parent was the root element, we do not add a dot after.
+      return str_replace(':.', ':', $this->parent->getFullName() . '.' . $this->getName());
+    }
+    else {
+      // If there is no parent, this is the root element, add a colon.
+      return $this->getName() . ':';
+    }
+  }
+
 }
diff --git a/core/lib/Drupal/Core/Config/Schema/Mapping.php b/core/lib/Drupal/Core/Config/Schema/Mapping.php
index a85fac4..a250821 100644
--- a/core/lib/Drupal/Core/Config/Schema/Mapping.php
+++ b/core/lib/Drupal/Core/Config/Schema/Mapping.php
@@ -63,7 +63,7 @@ public function get($property_name) {
       return $element;
     }
     else {
-      throw new \InvalidArgumentException(String::format("The configuration property @key doesn't exist.", array('@key' => $property_name)));
+      throw new \InvalidArgumentException(String::format("The configuration property @key.@element doesn't exist.", array('@key' => $this->getFullName(), '@element' => $property_name)));
     }
   }
 
diff --git a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
index 536a4cb..6c46944 100644
--- a/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
+++ b/core/lib/Drupal/Core/Config/Schema/SchemaCheckTrait.php
@@ -54,7 +54,7 @@ public function checkConfigSchema(TypedConfigManagerInterface $typed_config, $co
     }
     $definition = $typed_config->getDefinition($config_name);
     $data_definition = $typed_config->buildDataDefinition($definition, $config_data);
-    $this->schema = $typed_config->create($data_definition, $config_data);
+    $this->schema = $typed_config->create($data_definition, $config_data, $config_name);
     $errors = array();
     foreach ($config_data as $key => $value) {
       $errors = array_merge($errors, $this->checkValue($key, $value));
diff --git a/core/lib/Drupal/Core/Config/StorableConfigBase.php b/core/lib/Drupal/Core/Config/StorableConfigBase.php
index 5c6e8b3..5eab003 100644
--- a/core/lib/Drupal/Core/Config/StorableConfigBase.php
+++ b/core/lib/Drupal/Core/Config/StorableConfigBase.php
@@ -128,7 +128,7 @@ protected function getSchemaWrapper() {
     if (!isset($this->schemaWrapper)) {
       $definition = $this->typedConfigManager->getDefinition($this->name);
       $data_definition = $this->typedConfigManager->buildDataDefinition($definition, $this->data);
-      $this->schemaWrapper = $this->typedConfigManager->create($data_definition, $this->data);
+      $this->schemaWrapper = $this->typedConfigManager->create($data_definition, $this->data, $this->name);
     }
     return $this->schemaWrapper;
   }
@@ -178,7 +178,10 @@ protected function validateValue($key, $value) {
   protected function castValue($key, $value) {
     $element = $this->getSchemaWrapper()->get($key);
     // Do not cast value if it is unknown or defined to be ignored.
-    if ($element && ($element instanceof Undefined || $element instanceof Ignore)) {
+    if ($element && ($element instanceof Undefined)) {
+      throw new ConfigException(String::format("The configuration property @key is undefined.", array('@key' => $element->getFullName())));
+    }
+    elseif ($element && ($element instanceof Ignore)) {
       // Do validate the value (may throw UnsupportedDataTypeConfigException)
       // to ensure unsupported types are not supported in this case either.
       $this->validateValue($key, $value);
diff --git a/core/lib/Drupal/Core/Config/TypedConfigManager.php b/core/lib/Drupal/Core/Config/TypedConfigManager.php
index ba3f353..19811d3 100644
--- a/core/lib/Drupal/Core/Config/TypedConfigManager.php
+++ b/core/lib/Drupal/Core/Config/TypedConfigManager.php
@@ -80,7 +80,7 @@ public function get($name) {
     $data = $this->configStorage->read($name);
     $type_definition = $this->getDefinition($name);
     $data_definition =  $this->buildDataDefinition($type_definition, $data);
-    return $this->create($data_definition, $data);
+    return $this->create($data_definition, $data, $name);
   }
 
   /**
diff --git a/core/modules/user/config/install/views.view.who_s_new.yml b/core/modules/user/config/install/views.view.who_s_new.yml
index 7aa3a5d..3ed9388 100644
--- a/core/modules/user/config/install/views.view.who_s_new.yml
+++ b/core/modules/user/config/install/views.view.who_s_new.yml
@@ -174,3 +174,4 @@ langcode: en
 dependencies:
   module:
     - user
+    - block
diff --git a/core/modules/user/config/install/views.view.who_s_online.yml b/core/modules/user/config/install/views.view.who_s_online.yml
index 3b92c49..d2f4cab 100644
--- a/core/modules/user/config/install/views.view.who_s_online.yml
+++ b/core/modules/user/config/install/views.view.who_s_online.yml
@@ -204,3 +204,4 @@ langcode: en
 dependencies:
   module:
     - user
+    - block