"AttributeError: 'Ticket' object has no attribute 'is_writeable_field'"

[linuz]

Hi

Am using trac 0.11.7 with agilo plugin binary_agilo-1.3.4_PRO-
py2.6.egg. Am getting below error when i try to modify ticket with
batchmodify plugin.
AttributeError: 'Ticket' object has no attribute 'is_writeable_field'.
Also i have tried disabling batchmodify plugin. Then whenever am
modifying a ticket, it gets closed always.
Also i have tried all previous version of batchmodify plugin, still
with no luck.
Seems problem with agilo plugin. Can u please throw some light on
this?
I have only Batchmodify plugin and Agile-Trac plugin installed other
than agilo plugin. I tried disabling both but still no luck.