ExpatError: not well-formed (invalid token)

[alloylab]

I get the following error when trying to enroll a device, https://ip:8080/server
Any ideas what the issue is?

Traceback (most recent call last):
File "/usr/lib/python2.7/site-packages/web.py-0.37-py2.7.egg/web/application.py", line 239, in process
return self.handle()
File "/usr/lib/python2.7/site-packages/web.py-0.37-py2.7.egg/web/application.py", line 230, in handle
return self._delegate(fn, self.fvars, args)
File "/usr/lib/python2.7/site-packages/web.py-0.37-py2.7.egg/web/application.py", line 420, in _delegate
return handle_class(cls)
File "/usr/lib/python2.7/site-packages/web.py-0.37-py2.7.egg/web/application.py", line 396, in handle_class
return tocall(*args)
File "/server/server.py", line 342, in POST
pl = readPlistFromString(i)
File "/usr/lib64/python2.7/plistlib.py", line 103, in readPlistFromString
return readPlist(StringIO(data))
File "/usr/lib64/python2.7/plistlib.py", line 78, in readPlist
rootObject = p.parse(pathOrFile)
File "/usr/lib64/python2.7/plistlib.py", line 406, in parse
parser.ParseFile(fileobj)
ExpatError: not well-formed (invalid token): line 1, column 1