can't send a mail to partner from Send followups wizard

install acount_followup module
step -- --> go to Accounting/Periodical Processing/Billing/Send followups open wizard and click continue then add a partner in second wizard and click on send mail button so
it's give a error like "AttributeError: 'Field partner_id not found in browse_record(account_followup.stat, 200001)'"

addons = 5837
client = 2015
server = 3836

i put a traceback here
---------------------------------
Traceback (most recent call last):
  File "/home/mma/home/workplace/rdtools/server/trunk-configrework2-create-products-mma/openerp/osv/osv.py", line 120, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/mma/home/workplace/rdtools/server/trunk-configrework2-create-products-mma/openerp/osv/osv.py", line 172, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/mma/home/workplace/rdtools/server/trunk-configrework2-create-products-mma/openerp/osv/osv.py", line 163, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/mma/home/workplace/rdtools/addons/trunk/account_followup/wizard/account_followup_print.py", line 231, in do_mail
    partners.append(line.partner_id)
  File "/home/mma/home/workplace/rdtools/server/trunk-configrework2-create-products-mma/openerp/osv/orm.py", line 478, in __getattr__
    raise AttributeError(e)
AttributeError: 'Field partner_id not found in browse_record(account_followup.stat, 200001)'