--- a/runtime/NevowServer.py	Thu Jul 05 13:44:54 2018 +0200
+++ b/runtime/NevowServer.py	Thu Jul 05 13:45:24 2018 +0200
@@ -144,7 +144,7 @@
                     annotate.Argument(name, fieldtype)
                     for fieldname,fieldtype in fields],
                     label = desc),
-                action = btnlabel))
+                action = btnlabel)
         setattr(self, 'bind_'+name, _bind)
             
         setattr(self, 'action_'+name, callback)