Server error while running "roscore".

asked 2018-02-27 00:18:06 -0500

updated 2018-02-27 03:06:26 -0500

when I run roscore this error occurs. version:-ROS Kinetic UBUNTU 16.04LTS

melvin@melvin-HP-Notebook:~$ roscore
... logging to /home/melvin/.ros/log/d1cb9254-1ab8-11e8-b6a6-441ca8984d6d/roslaunch-melvin-HP-Notebook-4976.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.

Unable to contact my own server at [].
This usually means that the network is not configured properly.

A common cause is that the machine cannot ping itself.  Please check
for errors by running:


For more tips, please see

The traceback for the exception was written to the log file

export | grep -i ros gives output as

melvin@melvin-HP-Notebook:~$ ping
PING ( 56(84) bytes of data.
[1]+  Stopped                 ping
melvin@melvin-HP-Notebook:~$ export | grep -i ros
declare -x CMAKE_PREFIX_PATH="/opt/ros/kinetic"
declare -x LD_LIBRARY_PATH="/usr/local/cuda-8.0/lib64:/usr/local/lib:/opt/ros/kinetic/lib:/opt/ros/kinetic/lib/x86_64-linux-gnu"
declare -x OLDPWD="/home/melvin/ros"
declare -x PATH="/usr/local/cuda-8.0/bin:/opt/ros/kinetic/bin:/home/melvin/bin:/home/melvin/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin"
declare -x PKG_CONFIG_PATH="/opt/ros/kinetic/lib/pkgconfig:/opt/ros/kinetic/lib/x86_64-linux-gnu/pkgconfig"
declare -x PYTHONPATH="/opt/ros/kinetic/lib/python2.7/dist-packages"
declare -x ROS_DISTRO="kinetic"
declare -x ROS_ETC_DIR="/opt/ros/kinetic/etc/ros"
declare -x ROS_IP=""
declare -x ROS_MASTER_URI="http://localhost:11311"
declare -x ROS_PACKAGE_PATH="/opt/ros/kinetic/share"
declare -x ROS_ROOT="/opt/ros/kinetic/share/ros"
declare -x TURTLEBOT_GAZEBO_MAP_FILE="/opt/ros/kinetic/share/turtlebot_gazebo/maps/playground.yaml"
declare -x TURTLEBOT_GAZEBO_WORLD_FILE="/opt/ros/kinetic/share/turtlebot_gazebo/worlds/"
declare -x TURTLEBOT_MAP_FILE="/opt/ros/kinetic/share/turtlebot_navigation/maps/willow-2010-02-18-0.10.yaml"
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So, did you check if you can ping What is the result? Please also post the output of export | grep -i ros by editing your question?

mgruhler gravatar image mgruhler  ( 2018-02-27 01:43:01 -0500 )edit

The two error messages shown at the top of your screenshot (please don't post screenshots of text in the future) are suspicious. Did you add any export lines to your .bashrc? Those lines appear to be IPv6 addresses.

gvdhoorn gravatar image gvdhoorn  ( 2018-02-27 02:56:21 -0500 )edit

once i disabled my IPv6.but now i enabled again. and @mig i updated my question. cant ping.

sudo_melvinyesudas gravatar image sudo_melvinyesudas  ( 2018-02-27 03:03:41 -0500 )edit

So can you please show us those lines from your .bashrc? There seems to be an error or two in there.

gvdhoorn gravatar image gvdhoorn  ( 2018-02-27 03:05:05 -0500 )edit