I am a novice, please do not mind my ignorance. When I run:

$roslaunch lasermapper lasermapper.launch

It will error out with following message:

ERROR: cannot launch node of type [lasermapper/lasermappernode]: can't locate node [lasermappernode] in package [lasermapper]

I don't know if lasermappernode is available or what is the use of this file. Any idea how to resolve this? Thanks!