I am using s3cmd sync and the follow error occurd:   the network is available but slowly .Please help me to resolve it Thank you

Problem: ExpatError: not well-formed (invalid token): line 6, column 9
S3cmd:   0.9.9-rc3
Python:  2.5.2 (r252:60911, Oct  5 2008, 19:24:49)  [GCC 4.3.2]

Traceback (most recent call last):
  File "/root/s3cmd-0.9.9-rc3/s3cmd", line 1541, in <module>
  File "/root/s3cmd-0.9.9-rc3/s3cmd", line 1518, in main
  File "/root/s3cmd-0.9.9-rc3/s3cmd", line 320, in cmd_object_put
    response = s3.object_put(full_name, uri_final, extra_headers, extra_label = seq_label)
  File "/root/s3cmd-0.9.9-rc3/S3/S3.py", line 203, in object_put
    response = self.send_file(request, file, labels)
  File "/root/s3cmd-0.9.9-rc3/S3/S3.py", line 495, in send_file
    warning("Upload failed: %s (%s)" % (resource['uri'], S3Error(response)))
  File "/root/s3cmd-0.9.9-rc3/S3/Exceptions.py", line 44, in __init__
    tree = getTreeFromXml(response["data"])
  File "/root/s3cmd-0.9.9-rc3/S3/Utils.py", line 57, in getTreeFromXml
    tree = ET.fromstring(xml)
  File "/usr/lib/python2.5/xml/etree/ElementTree.py", line 963, in XML
  File "/usr/lib/python2.5/xml/etree/ElementTree.py", line 1245, in feed
    self._parser.Parse(data, 0)
ExpatError: not well-formed (invalid token): line 6, column 9