cannot launch node of type [mbf_costmap_nav/mbf_costmap_nav]

[irvan-k]

hi when i run
roslaunch mbf_beginner amcl_demo_relay_subscriber.launch
i get ERROR: cannot launch node of type [mbf_costmap_nav/mbf_costmap_nav]: Cannot locate node of type [mbf_costmap_nav] in package [mbf_costmap_nav]. Make sure file exists in package path and permission is set to executable (chmod +x)
I have used chmod and it doesn't make any change !!

[corot]

2 things to check

• did you compile mbf_costmap_nav?
• did you source devel/setup.bash after?