Error in using command of follow demo

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someone can you give me the solutions in this problem , this occur when i run roslaunch turtlebot3_follow_filter turtlebot3_follow_filter.launch ?

ResourceNotFound(name, ros_paths=self._ros_paths)
ResourceNotFound: turtlebot3_bringup
ROS path [0]=/opt/ros/kinetic/share/ros
ROS path [1]=/home/icad/catkin_ws/src
ROS path [2]=/opt/ros/kinetic/share

then it continue to give an error in the next command ( roslaunch turtlebot3_follower turtlebot3_follower.launch )

ImportError: No module named sklearn.ensemble.forest
[follower-1] process has died [pid 11560, exit code 1, cmd /home/icad/catkin_ws/src/turtlebot3_applications/turtlebot3_follower/nodes/follower __name:=follower __log:=/home/icad/.ros/log/21be3128-aada-11ea-9188-283a4d2fefa7/follower-1.log].
log file: /home/icad/.ros/log/21be3128-aada-11ea-9188-283a4d2fefa7/follower-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete

please2 help me to finish my final year project