SchoolTool error

Was exporting schooltool spreadsheet this morning and it threw out an error.

System failure.

Ticket nr. 999f0a90-3058-440d-afdf-458872411375.

Please contact your administrator.

Exception
row index (65536) not an int in range(65536)

Traceback
File "/usr/lib/python2.7/dist-packages/schooltool/task/tasks.py", line 184, in runTransaction
  result = callable(*args, **kw)
File "/usr/lib/python2.7/dist-packages/schooltool/report/report.py", line 451, in execute
  report_file = self.renderToFile(renderer, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/schooltool/report/report.py", line 500, in renderToFile
  self.renderReport(renderer, stream, *args, **kw)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 935, in renderReport
  workbook = renderer(*args, **kw)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 920, in __call__
  self.export_sections_enrollment(wb)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 737, in export_sections_enrollment
  ws, year, term, section, row=row)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 710, in export_section_enrollment
  ], ws, row=row)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 301, in print_table
  self.print_row(cells, ws, row=(row+y), col=col)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 306, in print_row
  self.write(ws, row, col+x, cell.data, **cell.style)
File "/usr/lib/python2.7/dist-packages/schooltool/export/export.py", line 155, in write
  ws.write(row, col, data, style)
File "/usr/lib/python2.7/dist-packages/xlwt/Worksheet.py", line 1030, in write
  self.row(r).write(c, label, style)
File "/usr/lib/python2.7/dist-packages/xlwt/Worksheet.py", line 1078, in row
  self.__rows[indx] = self.Row(indx, self)
File "/usr/lib/python2.7/dist-packages/xlwt/Row.py", line 42, in __init__
  raise ValueError("row index (%r) not an int in range(65536)" % rowx)

Exception
<ExceptionWithTraceback (ValueError('row index (65536) not an int in range(65536)',))>
Traceback
File "/usr/lib/python2.7/dist-packages/schooltool/task/tasks.py", line 211, in __call__
  result = self.runTransaction('execute', True, self, *args, **kwargs)
File "/usr/lib/python2.7/dist-packages/schooltool/task/tasks.py", line 201, in runTransaction
  raise failure