Почему не отправляется SOAP-запрос?

Сергей Горностаев,

self = <Sequence([<Element(name='messageInfo', type=<zeep.xsd.dynamic_types.MessageInfoType object at 0x00000блаблабла)>])>
parent = <Element {http://ip.ddd.ru/objects}parameter at блаблабла>
value = '<soapenv:Envelope xmlns:soapenv="http://блаблабла/soap/envelope/"  xmlns:obj="http://блаблаблаobjects">\n ...</obj:parameter>\n             </obj:GetOutgoingTrafficRequest>\n          </soapenv:Body>\n       </soapenv:Envelope>'
render_path = ['GetOutgoingTrafficRequest', 'parameter']

    def render(self, parent, value, render_path):
        """Create subelements in the given parent object."""
        if not isinstance(value, list):
            values = [value]
        else:
            values = value
    
        self.validate(values, render_path)
    
        for value in max_occurs_iter(self.max_occurs, values):
            for name, element in self.elements_nested:
                if name:
                    if name in value:
>                       element_value = value[name]
E                       TypeError: string indices must be integers, not 'str'