--- a/hgext/pushexperiment.py	Fri Oct 28 17:15:57 2016 -0700
+++ b/hgext/pushexperiment.py	Fri Oct 28 17:25:06 2016 -0700
@@ -12,6 +12,7 @@
 from StringIO import StringIO
 
 from mercurial.i18n import _
+from mercurial import error
 from mercurial import extensions
 from mercurial import wireproto
 from mercurial import obsolete