Python3 library pyxb throwing NamespaceError that category has no elementBiding - python-3.8

Question

I've started getting pyxb error while parsing a response. It worked before. The classes that parse the XML are made with pyxb from a the schema.
The XML is:
<result xmlns="http://payment.website.com/Schema/V2/Res">
<success>true</success>
<referenceId>reference_id_hash</referenceId>
<purchaseId>purchase_id_hash</purchaseId>
<returnType>REDIRECT</returnType>
<redirectUrl>https://payment.website.com/redirect/8f9359e15709e87bd0e4/MTAzYWQ5YWE4YjRjOGRjMjJ=</redirectUrl>
</result>
When I execute the CreateFromDocument I get an error that I cannot figure it out.
transaction_result = result.CreateFromDocument(response_content)
File "/usr/lib/python3.8/xml/sax/expatreader.py", line 111, in parse
xmlreader.IncrementalParser.parse(self, source)
File "/usr/lib/python3.8/xml/sax/xmlreader.py", line 125, in parse
self.feed(buffer)
File "/usr/lib/python3.8/xml/sax/expatreader.py", line 217, in feed
self._parser.Parse(data, isFinal)
File "../Modules/pyexpat.c", line 407, in StartElement
File "/usr/lib/python3.8/xml/sax/expatreader.py", line 369, in start_element_ns
self._cont_handler.startElementNS(pair, None,
File "/opt/venv/lib/python3.8/site-packages/pyxb/binding/saxer.py", line 324, in startElementNS
element_binding = name_en.elementBinding()
File "/opt/venv//lib/python3.8/site-packages/pyxb/namespace/__init__.py", line 104, in __getattr__
category_value = ns.categoryMap(name).get(self.localName())
File "/opt/venv/lib/python3.8/site-packages/pyxb/namespace/__init__.py", line 309, in categoryMap
raise pyxb.NamespaceError(self, '%s has no category %s' % (self, category))
Exception
pyxb.exceptions_.NamespaceError: http://payment.website.com/Schema/V2/Res has no category elementBinding 6 0.006 0.364
How can I fix this?