diff --git a/lib/Errors/NotFoundException.php b/lib/Errors/NotFoundException.php
new file mode 100644
index 0000000..ff6ee94
--- /dev/null
+++ b/lib/Errors/NotFoundException.php
@@ -0,0 +1,6 @@
+<?php
+
+namespace OCA\GroupfolderTags\Errors;
+
+abstract class NotFoundException extends \Exception {
+}
\ No newline at end of file
diff --git a/lib/Errors/TagNotFound.php b/lib/Errors/TagNotFound.php
new file mode 100644
index 0000000..210c065
--- /dev/null
+++ b/lib/Errors/TagNotFound.php
@@ -0,0 +1,6 @@
+<?php
+
+namespace OCA\GroupfolderTags\Errors;
+
+class TagNotFound extends NotFoundException {
+}
\ No newline at end of file