/opt/ros/kinetic/lib/gazebo_ros/debug: 5: [: Linux: unexpected operator

edit

When I am launching my model I am getting the following error:

glv@VaraPrasad:~/catkin_ws$ roslaunch my_mobilebot my_mobilebot.launch
... logging to /home/glv/.ros/log/d607c60a-e3f6-11e8-ae2d-9829a64aa0d2/roslaunch-VaraPrasad-1347.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.

started roslaunch server http://VaraPrasad:34401/

SUMMARY
========

PARAMETERS
 * /rosdistro: kinetic
 * /rosversion: 1.12.14
 * /use_sim_time: True

NODES
  /
    gazebo (gazebo_ros/debug)
    gazebo_gui (gazebo_ros/gzclient)

auto-starting new master
process[master]: started with pid [1357]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to d607c60a-e3f6-11e8-ae2d-9829a64aa0d2
process[rosout-1]: started with pid [1374]
started core service [/rosout]
process[gazebo-2]: started with pid [1382]
/opt/ros/kinetic/lib/gazebo_ros/debug: 5: [: Linux: unexpected operator
process[gazebo_gui-3]: started with pid [1399]
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Reading symbols from gzserver...(no debugging symbols found)...done.
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[ INFO] [1541750994.532718810]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1541750994.534274778]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[New Thread 0x7fffceb98700 (LWP 1493)]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]

[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[New Thread 0x7fffca683700 (LWP 1494)]
[New Thread 0x7fffc9e82700 (LWP 1495)]
[New Thread 0x7fffc9681700 (LWP 1498)]
[New Thread 0x7fffc8e80700 (LWP 1499)]
[New Thread 0x7fffc3fff700 (LWP 1501)]
[New Thread 0x7fffc37fe700 (LWP 1513)]
[New Thread 0x7fffc2ffd700 (LWP 1514)]
[New Thread 0x7fffc27fc700 (LWP 1515)]
[New Thread 0x7fffc1ffb700 (LWP 1516)]

[New Thread 0x7fffc17fa700 (LWP 1519)]
[New Thread 0x7fffc0ff9700 (LWP 1520)]
[New Thread 0x7fffabfff700 (LWP 1521)]
[New Thread 0x7fffab7fe700 (LWP 1522)]
[New Thread 0x7fffaaffd700 (LWP 1523)]
[New Thread 0x7fffaa7fc700 (LWP 1524)]
[New Thread 0x7fffa9ffb700 (LWP 1525)]
[ INFO] [1541750996.963564299]: Finished loading Gazebo ROS API Plugin.
[ INFO] [1541750996.965872363]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
[New Thread 0x7fffa97fa700 (LWP 1527)]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]


  [tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
    [

tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[tcsetpgrp failed in terminal_inferior: Inappropriate ioctl for device]
[New Thread 0x7fff7ffff700 (LWP 1528)]
[New Thread 0x7fff7f7fe700 ...