XML Parser issue

[nader14y]

I'm using latest version of this library in my django app. trying to get data from MLSListings RETS feed. It returns the following error:
Traceback (most recent call last):
File "update.py", line 225, in update_mls_server
search_result = client.search(
File "/home/ubuntu/idx/lib/python3.8/site-packages/rets/http/client.py", line 222, in search
return parse_search(rets_response)
File "/home/ubuntu/idx/lib/python3.8/site-packages/rets/http/parsers/parse.py", line 122, in parse_search
elem = parse_xml(response)
File "/home/ubuntu/idx/lib/python3.8/site-packages/rets/http/parsers/parse.py", line 18, in parse_xml
root = XML(response.content)
File "/usr/local/lib/python3.8/xml/etree/ElementTree.py", line 1320, in XML
parser.feed(text)
File "", line None
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 20, column 814

Although it works fine for other MLS feeds.