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@capa_matrix I had the same problem too and it was due to: (1) Your workspace was not added to the ROS_PACKAGE_PATH or (2) You have change the variable ROS_PACKAGE_PATH to only ~/catkin_ws or elsewhere

Try this:

$ export ROS_PACKAGE_PATH=~/catkin_ws:$ROS_PACKAGE_PATH
$ echo $ROS_PACKAGE_PATH

if you get

 /YOUR_DIRECTORY/catkin_ws:/opt/ros/groovy/share:/opt/ros/groovy/stacks

then launch your .launch file

$ roslaunch beginner_tutorials turtlemimic.launch

@capa_matrix I had the same problem too and it was due to: (1) Your my workspace was not added to the ROS_PACKAGE_PATH or (2) You have I had change the variable ROS_PACKAGE_PATH to only ~/catkin_ws or elsewhere

Try this:

$ export ROS_PACKAGE_PATH=~/catkin_ws:$ROS_PACKAGE_PATH
$ echo $ROS_PACKAGE_PATH

if you get

 /YOUR_DIRECTORY/catkin_ws:/opt/ros/groovy/share:/opt/ros/groovy/stacks

then launch your .launch file

$ roslaunch beginner_tutorials turtlemimic.launch