Unable to run hokuyo_node for Hokuyo URG-04LX

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Hi all,

I'm working on Surface Reconstruction from point cloud data and since in my lab there's an Hokuyo URG-04LX laser range finder, I would like to use it for building my data set. In order to get it working I followed this tutorial:

http://wiki.ros.org/hokuyo_node/Tutor...

In particular, I installed the ros node by running:

federico@HP-Compaq-8200:~$ sudo apt-get install ros-indigo-hokuyo-node

then, when I connect the laser to the PC, it gets associated to /dev/ttyUSB0 so I set the permissions for this port:

federico@HP-Compaq-8200:~$ ls -l /dev/ttyUSB0
crw-rw-rw- 1 root dialout 188, 0 gen 12 15:47 /dev/ttyUSB0

after this, I set the parameters for hokuyo_node:

federico@HP-Compaq-8200:~$ rosparam get /hokuyo_node/calibrate_time
false
federico@HP-Compaq-8200:~$ rosparam get /hokuyo_node/port 
/dev/ttyUSB0

as explained in the tutorial, but when I run the ROS node it gives me this error:

federico@HP-Compaq-8200:~$ rosrun hokuyo_node hokuyo_node 
[ERROR] [1452610493.392974859]: Exception thrown while opening Hokuyo.
timeout reached (in hokuyo::laser::laserReadline) You may find further details at http://www.ros.org/wiki/hokuyo_node/Troubleshooting

I really have no idea of what could cause this problem, so any help is greatly appreciated!!!

Thanks.