Error while printing General Journal

In Financial Management > Legal Statements > Generic Reports, print General Ledger and select all journals and periods. The following error is reported :

Environment Information :
System : Linux-2.6.32-24-generic-i686-with-Ubuntu-10.04-lucid
OS Name : posix
Distributor ID: Ubuntu
Description: Ubuntu 10.04.1 LTS
Release: 10.04
Codename: lucid
Operating System Release : 2.6.32-24-generic
Operating System Version : #39-Ubuntu SMP Wed Jul 28 06:07:29 UTC 2010
Operating System Architecture : 32bit
Operating System Locale : fr_BE.UTF8
Python Version : 2.6.5
OpenERP-Client Version : 5.0.11
Last revision No. & ID :1075 <email address hidden>
Traceback (most recent call last):
  File "/home/openerp/openerp/server/bin/service/web_services.py", line 683, in go
    (result, format) = obj.create(cr, uid, ids, datas, context)
  File "/home/openerp/openerp/server/bin/report/report_sxw.py", line 364, in create
    fnct_ret = fnct(cr, uid, ids, data, report_xml, context)
  File "/home/openerp/openerp/server/bin/report/report_sxw.py", line 426, in create_source_pdf
    return self.create_single_pdf(cr, uid, ids, data, report_xml, context)
  File "/home/openerp/openerp/server/bin/report/report_sxw.py", line 440, in create_single_pdf
    rml_parser.set_context(objs, data, ids, report_xml.report_type)
  File "/home/openerp/openerp/server/bin/addons/account/report/general_journal.py", line 50, in set_context
    self.period_ids, self.journal_ids = zip(*res)
ValueError: need more than 0 values to unpack