Amazon Integration Issue

Hello,
I try to sync product with amazon but it’s give me this error . i can’t get it is bug or i make any mistake . any help appreciate.

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py", line 61, in application
    response = frappe.handler.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 21, in handle
    data = execute_cmd(cmd)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 56, in execute_cmd
    return frappe.call(method, **frappe.form_dict)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 1019, in call
    return fn(*args, **newargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 84, in runserverobj
    frappe.desk.form.run_method.runserverobj(method, docs=docs, dt=dt, dn=dn, arg=arg, args=args)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/run_method.py", line 36, in runserverobj
    r = doc.run_method(method)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 772, in run_method
    out = Document.hook(fn)(self, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 1048, in composer
    return composed(self, method, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 1031, in runner
    add_to_return_value(self, fn(self, *args, **kwargs))
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 766, in <lambda>
    fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/erpnext_integrations/doctype/amazon_mws_settings/amazon_mws_settings.py", line 22, in get_products_details
    get_products_details()
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/erpnext_integrations/doctype/amazon_mws_settings/amazon_methods.py", line 47, in get_products_details
    create_item_code(product, sku)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/erpnext_integrations/doctype/amazon_mws_settings/amazon_methods.py", line 141, in create_item_code
    new_brand = create_brand(amazon_item_json)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/erpnext_integrations/doctype/amazon_mws_settings/amazon_methods.py", line 184, in create_brand
    filters={"brand":amazon_item_json.Product.AttributeSets.ItemAttributes.Brand})
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/erpnext_integrations/doctype/amazon_mws_settings/xml_utils.py", line 36, in __getattr__
    d = self.__getitem__(item)
KeyError: 'Brand'