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diff --git a/web/modules/contrib/libraries/src/Plugin/MissingPluginConfigurationException.php b/web/modules/contrib/libraries/src/Plugin/MissingPluginConfigurationException.php
new file mode 100644
index 000000000..515f13340
--- /dev/null
+++ b/web/modules/contrib/libraries/src/Plugin/MissingPluginConfigurationException.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\libraries\Plugin;
+
+use Drupal\Component\Plugin\Exception\PluginException;
+
+/**
+ * Provides an exception class for missing plugin configuration.
+ *
+ * The plugin system allows passing arbitrary data to plugins in form of the
+ * $configuration array. Some plugins, however, may depend on certain keys to
+ * be present in $configuration. This exception class can be used if such keys
+ * are missing.
+ *
+ * @todo Provide accessors for the passed-in information.
+ */
+class MissingPluginConfigurationException extends PluginException {
+
+  /**
+   * Constructs an exception for a missing plugin configuration value.
+   *
+   * @param string $plugin_id
+   *   The plugin ID.
+   * @param $plugin_definition
+   *   The plugin definition
+   * @param array $configuration
+   *   The plugin configuration.
+   * @param $missing_key
+   *   The missing key in the configuration.
+   * @param string $message
+   *   (optional) The exception message.
+   * @param int $code
+   *   (optional) The error code.
+   * @param \Exception $previous
+   *   (optional) The previous exception.
+   */
+  public function __construct(
+    $plugin_id,
+    $plugin_definition,
+    array $configuration,
+    $missing_key,
+    $message = '',
+    $code = 0,
+    \Exception $previous = NULL
+  ) {
+    $message = $message ?: "The '{$missing_key}' key is missing in the configuration of the '{$plugin_id}' plugin.";
+    parent::__construct($message, $code, $previous);
+  }
+
+}