Error in "roslaunch turtlebot3_gazebo turtlebot3_world.launch "

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Hi there, I'm new in ROS, i installed ROS-meloidic and working on wander robot, for that i need turtlebot simulator. i have downloaded the turtlebot3 by following command:

sudo apt-get install ros-melodic-turtlebot3-gazebo

and when i run roslaunch turtlebot3_gazebo turtlebot3_world.launch to run the turtlebot3 simulator, i get the following error:

Resource not found: turtlebot3_description
ROS path [0]=/opt/ros/melodic/share/ros
ROS path [1]=/home/kamal/wanderbot_ws/src
ROS path [2]=/home/kamal/catkin_ws/src
ROS path [3]=/opt/ros/melodic/share
The traceback for the exception was written to the log file

Please help me what should i do.

Thanks

Kamal