TypeError:字符串索引必须是整数，而不是str-OpenErp

我正在使用prestashop - openerp连接器模块，但当我尝试从网站导入数据时，会出现以下错误追溯：

  File "/usr/prestaconnect/openerp-connector/connector/queue/worker.py", line 122, in run_job
job.perform(session)
  File "/usr/prestaconnect/openerp-connector/connector/queue/job.py", line 460, in perform
self.result = self.func(session, *self.args, **self.kwargs)
  File "/usr/prestaconnect/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 663, in import_batch
importer.run(filters=filters, **kwargs)
 File "/usr/prestaconnect/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 202, in run
return super(PaymentMethodsImportSynchronizer, self).run(filters, **kwargs)
 File "/usr/prestaconnect/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 176, in run
record_ids = self._run_page(filters)
 File "/usr/prestaconnect/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 186, in _run_page
self._import_record(record_id, **kwargs)
 File "/usr/prestaconnect/prestashoperpconnect/prestashoperpconnect/unit/import_synchronizer.py", line 206, in _import_record
('name', '=', record['payment']),
TypeError: string indices must be integers, not str

在模块代码中，我看到的是：

 class PaymentMethodsImportSynchronizer(BatchImportSynchronizer):
_model_name = 'payment.method'
def run(self, filters=None, **kwargs):
    if filters is None:
        filters = {}
    filters['display'] = '[id,payment]'
    return super(PaymentMethodsImportSynchronizer, self).run(filters, **kwargs)
def _import_record(self, record):
    ids = self.session.search('payment.method', [
        ('name', '=', record['payment']),
        ('company_id', '=', self.backend_record.company_id.id),
    ])
    if ids:
        return
    self.session.create('payment.method', {
        'name': record['payment'],
        'company_id': self.backend_record.company_id.id,
    })

我不知道实际发生了什么，我需要一些说明，因为我没有开发这个模块，而且我是prestashop-openerp集成的新手。

如有任何帮助，我们将不胜感激，提前感谢！