TypeError: warn() takes exactly 2 arguments (4 given)

When creating a new DB, and configure CRM module, I experience the following error

[2010-12-21 09:44:01,609][os4biz] TEST:tests.crm:I click on "Schedule" button of this wizard.

[2010-12-21 09:44:01,615][os4biz] DEBUG:translate:no translation language detected, skipping translation for "'Phone Call'"
[2010-12-21 09:44:01,770][os4biz] INFO:i18n:module crm: loading translation file for language vi
[2010-12-21 09:44:01,770][os4biz] INFO:i18n:loading /var/local/software/openerp-v6.0dev/server/bin/addons/crm/i18n/vi.po
[2010-12-21 09:44:12,998][os4biz] ERROR:web-services:Uncaught exception
Traceback (most recent call last):
  File "/var/local/software/openerp-v6.0dev/server/bin/osv/osv.py", line 122, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/var/local/software/openerp-v6.0dev/server/bin/osv/osv.py", line 176, in execute
    res = self.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/var/local/software/openerp-v6.0dev/server/bin/osv/osv.py", line 167, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/var/local/software/openerp-v6.0dev/server/bin/addons/base/res/res_config.py", line 166, in action_next
    next = self.execute(cr, uid, ids, context=None)
  File "/var/local/software/openerp-v6.0dev/server/bin/addons/base/res/res_config.py", line 397, in execute
    pooler.restart_pool(cr.dbname, update_module=True)
  File "/var/local/software/openerp-v6.0dev/server/bin/pooler.py", line 60, in restart_pool
    return get_db_and_pool(db_name, force_demo, status, update_module=update_module)
  File "/var/local/software/openerp-v6.0dev/server/bin/pooler.py", line 39, in get_db_and_pool
    addons.load_modules(db, force_demo, status, update_module)
  File "/var/local/software/openerp-v6.0dev/server/bin/addons/__init__.py", line 865, in load_modules
    r = load_module_graph(cr, graph, status, report=report)
  File "/var/local/software/openerp-v6.0dev/server/bin/addons/__init__.py", line 762, in load_module_graph
    modobj.update_translations(cr, 1, [mid], None)
  File "/var/local/software/openerp-v6.0dev/server/bin/addons/base/module/module.py", line 506, in update_translations
    tools.trans_load(cr.dbname, f, lang, verbose=False, context=context)
  File "/var/local/software/openerp-v6.0dev/server/bin/tools/translate.py", line 817, in trans_load
    r = trans_load_data(db_name, fileobj, fileformat, lang, strict=strict, verbose=verbose, context=context)
  File "/var/local/software/openerp-v6.0dev/server/bin/tools/translate.py", line 898, in trans_load_data
    for row in reader:
  File "/var/local/software/openerp-v6.0dev/server/bin/tools/translate.py", line 351, in next
    self.cur_line(), source[:30])
TypeError: warn() takes exactly 2 arguments (4 given)
[2010-12-21 09:44:13,032][os4biz] DEBUG:web-services:netrpc: rpc-dispatching exception
Traceback (most recent call last):
  File "/var/local/software/openerp-v6.0dev/server/bin/service/netrpc_server.py", line 70, in run
    result = self.dispatch(msg[0], msg[1], msg[2:])
  File "/var/local/software/openerp-v6.0dev/server/bin/netsvc.py", line 499, in dispatch
    raise OpenERPDispatcherException(e, tb_s)
OpenERPDispatcherException

addons/ : 4017 <email address hidden>
addons-community/ : 292 fran@fran-pc-20101213182241-2fogs8yh5u4ma31q
addons-extra/ : 5098 <email address hidden>
server/ : 3120 <email address hidden>