--- /dev/null
+<?php
+
+namespace Drupal\migrate\Plugin\Exception;
+
+use Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException;
+
+/**
+ * Defines a class for bad plugin definition exceptions.
+ */
+class BadPluginDefinitionException extends InvalidPluginDefinitionException {
+
+ /**
+ * Constructs a BadPluginDefinitionException.
+ *
+ * For the remaining parameters see \Exception.
+ *
+ * @param string $plugin_id
+ * The plugin ID of the mapper.
+ * @param string $property
+ * The name of the property that is missing from the plugin.
+ *
+ * @see \Exception
+ */
+ public function __construct($plugin_id, $property, $code = 0, \Exception $previous = NULL) {
+ $message = sprintf('The %s plugin must define the %s property.', $plugin_id, $property);
+ parent::__construct($plugin_id, $message, $code, $previous);
+ }
+
+}