Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / lib / Drupal / Core / Extension / Exception / UninstalledExtensionException.php

diff --git a/web/core/lib/Drupal/Core/Extension/Exception/UninstalledExtensionException.php b/web/core/lib/Drupal/Core/Extension/Exception/UninstalledExtensionException.php
new file mode 100644 (file)
index 0000000..f0503f1
--- /dev/null
+++ b/web/core/lib/Drupal/Core/Extension/Exception/UninstalledExtensionException.php
@@ -0,0 +1,8 @@
+<?php
+
+namespace Drupal\Core\Extension\Exception;
+
+/**
+ * Exception class thrown when a specified extension has not been installed.
+ */
+class UninstalledExtensionException extends \InvalidArgumentException {}