diff --git a/error.py b/error.py
index 7e52b01..ff948f9 100644
--- a/error.py
+++ b/error.py
@@ -24,6 +24,13 @@
 class NoManifestException(Exception):
   """The required manifest does not exist.
   """
+  def __init__(self, path, reason):
+    super(NoManifestException, self).__init__()
+    self.path = path
+    self.reason = reason
+
+  def __str__(self):
+    return self.reason
 
 class EditorError(Exception):
   """Unspecified error from the user's text editor.