Import common error definitions

Change-Id: Iccd00631f72a5f7370de71e2e7ed07a738004e92
diff --git a/admin.py b/admin.py
index 9d97e45..f6c551e 100644
--- a/admin.py
+++ b/admin.py
@@ -24,6 +24,7 @@
 import time
 import logging
 import optparse
+from errors import CriticalError, InputError
 
 vlandpath = os.path.abspath(os.path.normpath(os.path.dirname(sys.argv[0])))
 sys.path.insert(0, vlandpath)