Plugin problem launching .launch [closed]

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Hi Ros users:

I have just created a pkg following this page link text It just creates a plugin and a world with the plugin. My problem is that when I launch the .launch terminal says:

gzserver: symbol lookup error: /home/alcor/catkin_ws/devel/lib/libgazebo_light_sensor_plugin.so: undefined symbol: _ZN6gazebo20GazeboRosCameraUtilsC2Ev
[gazebo-1] process has died [pid 20107, exit code 127, cmd /home/alcor/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros/scripts/gzserver --verbose -e ode /home/alcor/catkin_ws/src/gazebo_light_sensor_plugin/worlds/light.world __name:=gazebo __log:=/root/.ros/log/2a55e3fe-5872-11e5-af06-fcaa14787194/gazebo-1.log].
log file: /root/.ros/log/2a55e3fe-5872-11e5-af06-fcaa14787194/gazebo-1*.log

And Gazebo opens a black screen.

What am I doing wrong? How can I solve it?

Thanks a lot