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Most probably you have to add the new package path.

First check the ros stack paths using export | grep ROS
copy all the packages paths after the ROS_PACKAGE_PATH=
then export the new stack path for the Beginners_tutorials after the old paths using ":" some thing like that export ROS_PACKAGE_PATH=/home/user/ros/ros-pkg:/Beginners_tutorials/path
then use cd to the new stack folder and rosmake (if you did not do that before).

hopefully this will fix the problem.

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