ERROR: cannot launch node of type [hector_mapping/hector_mapping]: [closed]

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Hello , Im new to useing ROS. Im following this tutorial for creating a simulated ros navigation stack on a robot.

In the tutorial under Launch Mapping section I started the mapping process by,

        roslaunch hector_slam_launch tutorial.launch

When I run the command it opens up rviz but I get this error

ERROR: cannot launch node of type [hector_mapping/hector_mapping]: Cannot locate node of type [hector_mapping] in package [hector_mapping]. Make sure file exists in package path and permission is set to executable (chmod +x)

Rviz is opening but my map is not updating by slam . Can anyone know how can I resolve this ? , Thank you