Turtlebot Simulator World not coming up properly

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Hi All---

I have been new to ROS and Gazebo and have been trying to get the hands on the turtle bot in Gazebo simulator. I am using Ubuntu 14.04 version and ROS--Indigo and I have followed this tutorial to bring up the Turtle bot in the world describe in the the same link. However, I am not able to get the same world; infact I am only getting a blank world. Moroever, I got the following warning

jashanvir@jashanvir-Dell-System-XPS-L502X:~$ roslaunch turtlebot_gazebo turtlebot_world.launch
... logging to /home/jashanvir/.ros/log/68c77ab0-7d9e-11e6-8601-88532e0c5102/roslaunch-jashanvir-Dell-System-XPS-L502X-19685.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://jashanvir-Dell-System-XPS-L502X:39528/

SUMMARY
========

PARAMETERS
 * /bumper2pointcloud/pointcloud_radius: 0.24
 * /cmd_vel_mux/yaml_cfg_file: /opt/ros/indigo/s...
 * /depthimage_to_laserscan/output_frame_id: /camera_depth_frame
 * /depthimage_to_laserscan/range_min: 0.45
 * /depthimage_to_laserscan/scan_height: 10
 * /robot_description: <?xml version="1....
 * /robot_state_publisher/publish_frequency: 30.0
 * /rosdistro: indigo
 * /rosversion: 1.11.20
 * /use_sim_time: True

NODES
  /
    bumper2pointcloud (nodelet/nodelet)
    cmd_vel_mux (nodelet/nodelet)
    depthimage_to_laserscan (nodelet/nodelet)
    gazebo (gazebo_ros/gzserver)
    gazebo_gui (gazebo_ros/gzclient)
    laserscan_nodelet_manager (nodelet/nodelet)
    mobile_base_nodelet_manager (nodelet/nodelet)
    robot_state_publisher (robot_state_publisher/robot_state_publisher)
    spawn_turtlebot_model (gazebo_ros/spawn_model)

auto-starting new master
process[master]: started with pid [19700]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 68c77ab0-7d9e-11e6-8601-88532e0c5102
process[rosout-1]: started with pid [19713]
started core service [/rosout]
process[gazebo-2]: started with pid [19728]
process[gazebo_gui-3]: started with pid [19740]
process[spawn_turtlebot_model-4]: started with pid [19745]
process[mobile_base_nodelet_manager-5]: started with pid [19746]
process[cmd_vel_mux-6]: started with pid [19747]
process[bumper2pointcloud-7]: started with pid [19748]
process[robot_state_publisher-8]: started with pid [19757]
process[laserscan_nodelet_manager-9]: started with pid [19765]
process[depthimage_to_laserscan-10]: started with pid [19775]
Gazebo multi-robot simulator, version 2.2.3
Copyright (C) 2012-2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Gazebo multi-robot simulator, version 2.2.3
Copyright (C) 2012-2014 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org

Msg Waiting for master
Msg Connected to gazebo master @ http://127.0.0.1:11345
Msg Publicized address: 192.168.1.5
Exception [Master.cc:50] Unable to start server[bind: Address already in use]. There is probably another Gazebo process running.

Exception [Master.cc:50] Unable to start server[bind: Address already in use]. There is probably another Gazebo process running.

[gazebo-2] process has died [pid 19728, exit code 255, cmd /opt/ros/indigo/lib/gazebo_ros/gzserver -e ode /opt/ros/indigo/share/turtlebot_gazebo/worlds/playground.world __name:=gazebo __log:=/home/jashanvir/.ros/log/68c77ab0-7d9e-11e6-8601-88532e0c5102/gazebo-2.log].
log file: /home/jashanvir/.ros/log/68c77ab0-7d9e-11e6-8601-88532e0c5102/gazebo-2*.log

Could any body provide the fix for the same? One more thing I want to add is that I waited for 15 minutes so that the world come up but it doesn't.

Thanks.