ParseError: reference to invalid character number

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An unexpected error has occurred.
Please report the following lines to:
s3tools-bugs@lists.sourceforge.net
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Problem: ParseError: reference to invalid character number: line 2, column 2329
S3cmd: 1.1.0-beta3

Traceback (most recent call last):
File "/usr/local/bin/s3cmd", line 1800, in <module>
main()
File "/usr/local/bin/s3cmd", line 1741, in main
cmd_func(args)
File "/usr/local/bin/s3cmd", line 45, in cmd_du
subcmd_bucket_usage(s3, uri)
File "/usr/local/bin/s3cmd", line 69, in subcmd_bucket_usage
response = s3.bucket_list(bucket, prefix = object, recursive = True)
File "/Library/Python/2.7/site-packages/S3/S3.py", line 217, in bucket_list
current_list = _get_contents(response["data"])
File "/Library/Python/2.7/site-packages/S3/S3.py", line 205, in _get_contents
return getListFromXml(data, "Contents")
File "/Library/Python/2.7/site-packages/S3/Utils.py", line 79, in getListFromXml
tree = getTreeFromXml(xml)
File "/Library/Python/2.7/site-packages/S3/Utils.py", line 69, in getTreeFromXml
tree = ET.fromstring(xml)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1282, in XML
parser.feed(text)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1624, in feed
self._raiseerror(v)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1488, in _raiseerror
raise err
ParseError: reference to invalid character number: line 2, column 2329