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Please help, the same problem:

I have the same host - ISPconfig

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/gevent/greenlet.py", line 534, in run
result = self._run(*self.args, **self.kwargs)
File "/usr/lib/python2.7/dist-packages/gevent/baseserver.py", line 25, in _handle_and_close_when_done
return handle(*args_tuple)
File "/usr/lib/python2.7/dist-packages/gevent/server.py", line 127, in wrap_socket_and_handle
return self.handle(ssl_socket, address)
File "/usr/lib/python2.7/dist-packages/socketio/server.py", line 124, in handle
handler.handle()
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 443, in handle
result = self.handle_one_request()
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 658, in handle_one_request
self.handle_one_response()
File "/usr/lib/pymodules/python2.7/ajenti/http.py", line 25, in handle_one_response
return SocketIOHandler.handle_one_response(self)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 122, in handle_one_response
return self._do_handshake(handshake_tokens.groupdict())
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 64, in _do_handshake
self.write_smart(data)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 88, in write_smart
self.write_plain_result(data)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 78, in write_plain_result
("Content-Type", "text/plain"),
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 778, in start_response
raise UnicodeError("The value must be a native string", header, value)
UnicodeError: ('The value must be a native string', 'Access-Control-Max-Age', 3600)
failed with UnicodeError

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/gevent/greenlet.py", line 534, in run
result = self._run(*self.args, **self.kwargs)
File "/usr/lib/python2.7/dist-packages/gevent/baseserver.py", line 25, in _handle_and_close_when_done
return handle(*args_tuple)
File "/usr/lib/python2.7/dist-packages/gevent/server.py", line 127, in wrap_socket_and_handle
return self.handle(ssl_socket, address)
File "/usr/lib/python2.7/dist-packages/socketio/server.py", line 124, in handle
handler.handle()
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 443, in handle
result = self.handle_one_request()
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 658, in handle_one_request
self.handle_one_response()
File "/usr/lib/pymodules/python2.7/ajenti/http.py", line 25, in handle_one_response
return SocketIOHandler.handle_one_response(self)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 122, in handle_one_response
return self._do_handshake(handshake_tokens.groupdict())
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 64, in _do_handshake
self.write_smart(data)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 88, in write_smart
self.write_plain_result(data)
File "/usr/lib/python2.7/dist-packages/socketio/handler.py", line 78, in write_plain_result
("Content-Type", "text/plain"),
File "/usr/lib/python2.7/dist-packages/gevent/pywsgi.py", line 778, in start_response
raise UnicodeError("The value must be a native string", header, value)
UnicodeError: ('The value must be a native string', 'Access-Control-Max-Age', 3600)
failed with UnicodeError