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I had same errors. 1. Is catkin_make successful. Easy way to check your launch files is ok. "using 'double tap'" for example, 1. roslaunch 'first spelling of your package name' (tap tap) 2. roslaunch 'your package name' 'first spelling of your launch file name' (tap tap) If there is no auto fill, then you fail at catkin_make. 2. Is launch file? It can be "rosrun"

I had same errors. 1. errors.

1. Is catkin_make successful. Easy way to check your launch files is ok. "using 'double tap'" for example, 1. example,
2. roslaunch 'first spelling of your package name' (tap tap) 2. tap)
3. roslaunch 'your package name' 'first spelling of your launch file name' (tap tap) If there is no auto fill, then you fail at catkin_make. 2. Is launch file? It can be "rosrun"

I had same errors.