Problem TurtleBot3_teleop [closed]

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Hey

I am trying to control my TurtleBot3 with my PC keyboard. I follow the tutorial from e-robotis. I am using ROS Kinetic and I got the error messages. I tried with another node and the same error message showed up.

The following messages:

auto-starting new master

process[master]: started with pid [5697]

ERROR: Unable to start XML-RPC server, port 11311 is already in use Unhandled exception in thread started by <bound method="" xmlrpcnode.run="" of="" <rosgraph.xmlrpc.xmlrpcnode="" object="" at="" 0x7f3a47d31b10="">>

Traceback (most recent call last):

File "/opt/ros/kinetic/lib/python2.7/dist-packages/rosgraph/xmlrpc.py", line 215, in run self._run()

File "/opt/ros/kinetic/lib/python2.7/dist-packages/rosgraph/xmlrpc.py", line 284, in _run self._run_init()

File "/opt/ros/kinetic/lib/python2.7/dist-packages/rosgraph/xmlrpc.py", line 234, in _run_init self.server = ThreadingXMLRPCServer((bind_address, port), log_requests)

File "/opt/ros/kinetic/lib/python2.7/dist-packages/rosgraph/xmlrpc.py", line 115, in __init__ SimpleXMLRPCServer.__init__(self, addr, SilenceableXMLRPCRequestHandler, log_requests)

File "/usr/lib/python2.7/SimpleXMLRPCServer.py", line 593, in __init__ SocketServer.TCPServer.__init__(self, addr, requestHandler, bind_and_activate)

File "/usr/lib/python2.7/SocketServer.py", line 417, in __init__ self.server_bind()

File "/usr/lib/python2.7/SocketServer.py", line 431, in server_bind self.socket.bind(self.server_address)

File "/usr/lib/python2.7/socket.py", line 228, in meth return getattr(self._sock,name)(*args)

socket.error: [Errno 98] Address already in use

ERROR: could not contact master [https://192.168.0.102:11311]

The traceback for the exception was written to the log file

[master] killing on exit

Unhandled exception in thread started by

sys.excepthook is missing

lost sys.stderr

what do the messages mean and how to solve it?