error lms registro curso

gistfile1.py

2014-04-02 17:03:38,920 ERROR 15823 [root] exceptions.py:9 - Uncaught exception from <class 'django.core.handlers.wsgi.WSGIHandler'>
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/decorators/http.py", line 41, in inner
    return func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/common/djangoapps/student/views.py", line 628, in change_enrollment
    if not levels[profile.level_of_education] >= levels[course.level_of_education]:
KeyError: None
Unable to reach Sentry log server: <urlopen error [Errno -2] Name or service not known> (url: https://sentry.iaen.edu.ec:9000/api/3/store/)
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/raven/base.py", line 526, in send_remote
    transport.send(data, headers)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/raven/transport/base.py", line 223, in send
    response = compat.urlopen(req, data, self.timeout).read()
  File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 400, in open
    response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 418, in _open
    '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 1215, in https_open
    return self.do_open(httplib.HTTPSConnection, req)
  File "/usr/lib/python2.7/urllib2.py", line 1177, in do_open
    raise URLError(err)
URLError: <urlopen error [Errno -2] Name or service not known>
2014-04-02 17:03:40,703 ERROR 15823 [sentry.errors] base.py:502 - Unable to reach Sentry log server: <urlopen error [Errno -2] Name or service not known> (url: https://sentry.iaen.edu.ec:9000/api/3/store/)
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/raven/base.py", line 526, in send_remote
    transport.send(data, headers)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/raven/transport/base.py", line 223, in send
    response = compat.urlopen(req, data, self.timeout).read()
  File "/usr/lib/python2.7/urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 400, in open
    response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 418, in _open
    '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 1215, in https_open
    return self.do_open(httplib.HTTPSConnection, req)
  File "/usr/lib/python2.7/urllib2.py", line 1177, in do_open
    raise URLError(err)
URLError: <urlopen error [Errno -2] Name or service not known>
Failed to submit message: u'KeyError: None'
2014-04-02 17:03:40,705 ERROR 15823 [sentry.errors] base.py:505 - Failed to submit message: u'KeyError: None'
2014-04-02 17:03:40,706 ERROR 15823 [django.request] base.py:215 - Internal Server Error: /change_enrollment
Traceback (most recent call last):
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/django/views/decorators/http.py", line 41, in inner
    return func(request, *args, **kwargs)
  File "/edx/app/edxapp/edx-platform/common/djangoapps/student/views.py", line 628, in change_enrollment
    if not levels[profile.level_of_education] >= levels[course.level_of_education]:
KeyError: None