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you try to compile your node before ros knows about your workspace.


  1. "source ./devel/setup.bash" or even better, source the setup.bash in your .bashrc
  2. do catkin_make in your workspace
  3. if you got no errors, rosrun your node with

    rosrun forward gg

IMPORTANT: you CANT rosrun a cpp file and never change ROS_PACKAGE_PATH by hand! always source the setup.bash