HR Attendance: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 384: ordinal not in range(128)

Steps To reproduce:
Open the Employee form view.
print the "Attendance By week " Report faced the following traceback on server side.

[2011-04-27 12:21:02,240][db_bug] ERROR:web-services:[01]:
[2011-04-27 12:21:02,241][db_bug] ERROR:web-services:[02]: Environment Information :
[2011-04-27 12:21:02,241][db_bug] ERROR:web-services:[03]: System : Linux-2.6.32-22-generic-i686-with-Ubuntu-10.04-lucid
[2011-04-27 12:21:02,241][db_bug] ERROR:web-services:[04]: OS Name : posix
[2011-04-27 12:21:02,242][db_bug] ERROR:web-services:[05]: Distributor ID: Ubuntu
[2011-04-27 12:21:02,242][db_bug] ERROR:web-services:[06]: Description: Ubuntu 10.04 LTS
[2011-04-27 12:21:02,242][db_bug] ERROR:web-services:[07]: Release: 10.04
[2011-04-27 12:21:02,242][db_bug] ERROR:web-services:[08]: Codename: lucid
[2011-04-27 12:21:02,243][db_bug] ERROR:web-services:[09]: Operating System Release : 2.6.32-22-generic
[2011-04-27 12:21:02,243][db_bug] ERROR:web-services:[10]: Operating System Version : #33-Ubuntu SMP Wed Apr 28 13:27:30 UTC 2010
[2011-04-27 12:21:02,248][db_bug] ERROR:web-services:[11]: Operating System Architecture : 32bit
[2011-04-27 12:21:02,249][db_bug] ERROR:web-services:[12]: Operating System Locale : en_IN.UTF8
[2011-04-27 12:21:02,249][db_bug] ERROR:web-services:[13]: Python Version : 2.6.5
[2011-04-27 12:21:02,249][db_bug] ERROR:web-services:[14]: OpenERP-Server Version : 6.1-dev
[2011-04-27 12:21:02,249][db_bug] ERROR:web-services:[15]: Exception: 'ascii' codec can't decode byte 0xc3 in position 384: ordinal not in range(128)
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[16]: Traceback (most recent call last):
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[17]: File "/home/tiny/workspace/openobject-server/openerp/service/web_services.py", line 723, in go
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[18]: (result, format) = obj.create(cr, uid, ids, datas, context)
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[19]: File "/home/tiny/workspace/openobject-server/openerp/report/interface.py", line 86, in create
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[20]: xml = self.create_xml(cr, uid, ids, datas, context)
[2011-04-27 12:21:02,250][db_bug] ERROR:web-services:[21]: File "/home/tiny/workspace/openobject-addons/hr_attendance/report/timesheet.py", line 112, in create_xml
[2011-04-27 12:21:02,251][db_bug] ERROR:web-services:[22]: return self.post_process_xml_data(cr, uid, xml, context)
[2011-04-27 12:21:02,251][db_bug] ERROR:web-services:[23]: File "/home/tiny/workspace/openobject-server/openerp/report/interface.py", line 132, in post_process_xml_data
[2011-04-27 12:21:02,251][db_bug] ERROR:web-services:[24]: return xml[:pos_xml] + corporate_header[pos_header:] + xml[pos_xml:]
[2011-04-27 12:21:02,251][db_bug] ERROR:web-services:[25]: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 384: ordinal not in range(128)

Thanks.