AttributeError: 'bool' object has no attribute 'ljust'
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  File "onadata/libs/utils/export_builder.py", line 1495, in to_zipped_sav
    write_row(self.pre_process_row(row, section), sav_writer, fields)
  File "onadata/libs/utils/export_builder.py", line 1443, in write_row
    sav_writer.writerow(
  File "savWriter.py", line 386, in writerow
    self._pyWriterow(record)
  File "savWriter.py", line 375, in _pyWriterow
    value = pad_string(value, varType)
  File "savWriter.py", line 353, in _padStringValue
    return value.ljust(self.pad_8_lookup[varType])