turtlebot-simulater

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Hello,all.

I tried to run turtlebot-simulator by executing the following commands.

$ sudo apt-get install ros-hydro-turtlebot-simulator

$ sudo apt-get install ros-hydro-turtlebot-apps

$ sudo apt-get install ros-hydro-turtlebot-rviz-launchers

$ source /opt/ros/hydro/setup.bash

$ roslaunch turtlebot_gazebo turtlebot_empty_world.launch

but the error occurred.

gzserver: symbol lookup error: /opt/ros/hydro/lib/libgazebo_ros_paths_plugin.so: undefined symbol: _ZN3ros7package10getPluginsERKSsS2_RSt6vectorISsSaISsEEb

what does the error mean ?