The error exactly is
[ERROR] [1546860953.191408064]: Could not find parameter robot_description on parameter server
[rob_st_pub-6] process has died [pid 2696, exit code 255, cmd /opt/ros/kinetic/lib/robot_state_publisher/robot_state_publisher robot_description:=spider_robot_description /joint_states:=/spider_joint_states __name:=rob_st_pub __log:=/home/microbot/.ros/log/63188c6c-1270-11e9-929e-2c6e85b13edd/rob_st_pub-6.log].
log file: /home/microbot/.ros/log/63188c6c-1270-11e9-929e-2c6e85b13edd/rob_st_pub-6*.log
I am beginner, from what I have understood, I believe the error is caused because robot_state_publisher node can not fetch the robot_description in order to work with. But when I checked the parameter list using command I could see the robot_description parameter in the list and also I could see the xml file created from xacro when I checked with command. Now I am unsure about the reason behind this error. Here I am also attaching my control launch file,
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