lxml error

Traceback (most recent call last):
  File "services.py", line 11, in <module>
    url,
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/client.py", line 62, in __init__
    wsdl, self.transport, settings=self.settings)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/wsdl/wsdl.py", line 84, in __init__
    root_definitions = Definition(self, document, self.location)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/wsdl/wsdl.py", line 184, in __init__
    self.messages = self.parse_messages(doc)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/wsdl/wsdl.py", line 336, in parse_messages
    msg = parse.parse_abstract_message(self, msg_node)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/wsdl/parse.py", line 43, in parse_abstract_message
    part_type = qname_attr(part, 'type', tns)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/utils.py", line 13, in qname_attr
    return as_qname(value, node.nsmap, target_namespace)
  File "/Users/gbrennon/Documents/Projects/Sercortes/sercortes/env/lib/python3.6/site-packages/zeep/utils.py", line 37, in as_qname
    return etree.QName(namespace, local)
  File "src/lxml/etree.pyx", line 1826, in lxml.etree.QName.__init__
  File "src/lxml/apihelpers.pxi", line 1626, in lxml.etree._tagValidOrRaise
ValueError: Invalid tag name 'string[]'