diff --git a/pisi/errors.py b/pisi/errors.py
new file mode 100644
index 00000000..4d46c1bc
--- /dev/null
+++ b/pisi/errors.py
@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2008, TUBITAK/UEKAE
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 2 of the License, or (at your option)
+# any later version.
+#
+# Please read the COPYING file.
+
+class AnotherInstanceError(Exception):
+    pass