[ros-users] missing libgazebo_ros_time.so

Hi everybody

I am new here.

I have just installed gazebo-tools and pr2-gazebo as per instructions on web
site and when i tried to run empty world I got this error:

ODE Message 2: inertia must be positive definite in dMassCheck() File
mass.cpp Line 53
Error Loading Gazebo
/home/tingting/ros/stacks/simulator_gazebo/gazebo/gazebo-svn/server/Simulator.cc:240
: Exception: Failed to load the World
/home/tingting/ros/stacks/simulator_gazebo/gazebo/gazebo-svn/server/controllers/ControllerFactory.cc:116
: Exception: Failed to load libgazebo_ros_time.so: file not found


I have no idea where can i find libgazebo_ros_time.so and where should i put
it

any help will be great.

thanks

Amy