The detailed error is given below

<class 'httplib.BadStatusLine'> Exception in Tk callback
  Function: <bound method MidasUI.processCommand of <Midas.midas_ui.MidasUI instance at 0x048CA508>> (type: <type 'instancemethod'>)
  Args: (<Tkinter.Event instance at 0x064D9300>,)
  Event type: KeyPress (type num: 2)
Traceback (innermost last):
  File "C:\Program Files\Chimera 1.7\bin\lib\site-packages\Pmw\Pmw_1_3\lib\PmwBase.py", line 1747, in __call__
    return apply(self.func, args)
  File "C:\Program Files\Chimera 1.7\share\Midas\midas_ui.py", line 270, in processCommand
    midas_text.makeCommand(cmdText)
  File "C:\Program Files\Chimera 1.7\share\Midas\midas_text.py", line 69, in makeCommand
    f(c, args)
  File "C:\Program Files\Chimera 1.7\share\Midas\midas_text.py", line 1449, in doOpen
    modelArg, noprefs)
  File "<string>", line 1, in <module>
    None
  File "C:\Program Files\Chimera 1.7\share\Midas\__init__.py", line 2033, in open
    noprefs=noprefs)
  File "C:\Program Files\Chimera 1.7\share\chimera\__init__.py", line 1745, in open
    models = func(filename, *args, **kw)
  File "C:\Program Files\Chimera 1.7\share\SeqAnnotations\ChimeraExtension.py", line 27, in showUniprotSeq
    self.module().showUniprotSeq(ident)
  File "C:\Program Files\Chimera 1.7\share\SeqAnnotations\__init__.py", line 302, in showUniprotSeq
    acc = mapUniprotNameID(ident)
  File "C:\Program Files\Chimera 1.7\share\SeqAnnotations\__init__.py", line 62, in mapUniprotNameID
    response = urllib2.urlopen(request)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 126, in urlopen
    return _opener.open(url, data, timeout)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 406, in open
    response = meth(req, response)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 519, in http_response
    'http', request, response, code, msg, hdrs)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 438, in error
    result = self._call_chain(*args)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 378, in _call_chain
    result = func(*args)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 625, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 400, in open
    response = self._open(req, data)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 418, in _open
    '_open', req)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 378, in _call_chain
    result = func(*args)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 1207, in http_open
    return self.do_open(httplib.HTTPConnection, req)
  File "C:\Program Files\Chimera 1.7\bin\lib\urllib2.py", line 1180, in do_open
    r = h.getresponse(buffering=True)
  File "C:\Program Files\Chimera 1.7\bin\lib\httplib.py", line 1030, in getresponse
    response.begin()
  File "C:\Program Files\Chimera 1.7\bin\lib\httplib.py", line 407, in begin
    version, status, reason = self._read_status()
  File "C:\Program Files\Chimera 1.7\bin\lib\httplib.py", line 371, in _read_status
    raise BadStatusLine(line)
<class 'httplib.BadStatusLine'>: ''

================================================
  Event contents:
    char:
    delta: 13
    height: ??
    keycode: 13
    keysym: Return
    keysym_num: 65293
    num: ??
    serial: 38444
    state: 8
    time: 69416531
    type: 2
    widget: .44391680.76326552.76670056.76670616.76670816
    width: ??
    x: 174
    x_root: 227
    y: 13
    y_root: 942

BadStatusLine: ''

  File "C:\Program Files\Chimera 1.7\bin\lib\httplib.py", line 371, in _read_status
    raise BadStatusLine(line)

See reply log for Python traceback.