Resource not found: turtlebot3_description

[prabanjan2419]

prabanjan@ubuntu:~$ echo $TURTLEBOT3_MODEL waffle_pi prabanjan@ubuntu:~$ source ~/.bashrc prabanjan@ubuntu:~$ roslaunch turtlebot3_gazebo turtlebot3_world.launch ... logging to /home/prabanjan/.ros/log/4a5e619c-858b-11ec-856a-000c29ccc10b/roslaunch-ubuntu-7199.log Checking log directory for disk usage. This may take a while. Press Ctrl-C to interrupt Done checking log file disk usage. Usage is <1GB.

WARNING: Package name "Mine_description" does not follow the naming conventions. It should start with a lower case letter and only contain lower case letters, digits, underscores, and dashes. WARNING: Package name "Mine_description" does not follow the naming conventions. It should start with a lower case letter and only contain lower case letters, digits, underscores, and dashes. Resource not found: turtlebot3_description ROS path [0]=/opt/ros/melodic/share/ros ROS path [1]=/home/prabanjan/gitbee/src ROS path [2]=/home/prabanjan/rigbee/src ROS path [3]=/home/prabanjan/ros/src ROS path [4]=/home/prabanjan/ADAS/src ROS path [5]=/home/prabanjan/catkin_ws/src ROS path [6]=/opt/ros/melodic/share The traceback for the exception was written to the log file

I am getting this error. How can I resolve?