[web2py] error export represet

[www.diazluis.com]

{{
import cStringIO
stream=cStringIO.StringIO()
estudiante_arancel_rows.export_to_csv_file(ofile=stream, represent=True)
response.headers['Content-Type']='application/vnd.ms-excel'
response.headers['Content-Disposition'] =  "attachment; filename=%s" % 
'data_sga.csv'
response.write(stream.getvalue(), escape=False)
}}


Traceback (most recent call last):
  File "/home/diazluis2007/web2py/gluon/restricted.py", line 212, in 
restricted
    exec ccode in environment
  File 
"/home/diazluis2007/web2py/applications/sga/views/estudiante_arancel/exportar_excel.html",
 
line 3, in <module>
    stream=cStringIO.StringIO()
  File "/home/diazluis2007/web2py/gluon/dal.py", line 9249, in 
export_to_csv_file
    value = field.represent(value)
TypeError: <lambda>() takes exactly 2 arguments (1 given)

 web2py: 2.2.1

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