Thanks for your question. However we ask that you please ask questions on http://answers.ros.org following our support guidelines: http://wiki.ros.org/Support In short, this is not a turtlebot3 issue. You have a problem with my_first_pkg's 'hello.cpp' file. Removing the 'my_first_pkg' package in the 'catkin_ws/src/' directory will solve this problem. :slight_smile: [quote="Basma_Elkilany, post:1, topic:4332"] [ 1%] Built target std_msgs_generate_messages_nodejs /home/basma/catkin_ws/src/my_first_pkg/src/hello.cpp:2:21: fatal error: ros/ros.h: No such file or directory compilation terminated. [/quote] --- [Visit Topic](https://discourse.ros.org/t/invoking-make-j4-l4-failed/4332/2) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: