UWsim Dynamics launch file error

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Hi guys, i'm trying to Creating dynamic simulation (UWsim)with this code :

roslaunch underwater_vehicle_dynamics UWSim_g500_dynamics.launch

but i get these errors:

[UWSim_g500_dynamics.launch] is neither a launch file in package [underwater_vehicle_dynamics] nor is [underwater_vehicle_dynamics] a launch file name

The traceback for the exception was written to the log file

i did these steps :

1. mkdir -p ~/catkin_ws/src
2. cd ~/catkin_ws
3. catkin_make
4. source /home/hossein/catkin_ws/devel/setup.bash
5. roslaunch underwater_vehicle_dynamics UWSim_g500_dynamics.launch

can anyone help me ? i'm using Ubuntu 14.04.5 Virtual Box with ROS indigo