Razer Hydra controller tutorial : Unable to find razer device

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I am following thus TUTORIAL

I tried to run gazebo --verbose hydra_demo.world

The GUI did open and a sphere appeared in there. However, I got an error message on the console:

Gazebo multi-robot simulator, version
7.0.0 Copyright (C) 2012-2016 Open Source Robotics Foundation. Released under the Apache 2 License. http://gazebosim.org

[Msg] Waiting for master. [Msg] Connected to gazebo master @ http://127.0.0.1:11345 [Msg] Publicized address: 10.27.122.58 Gazebo multi-robot simulator, version
7.0.0 Copyright (C) 2012-2016 Open Source Robotics Foundation. Released under the Apache 2 License. http://gazebosim.org

[Msg] Waiting for master. [Msg] Connected to gazebo master @ http://127.0.0.1:11345 [Msg] Publicized address: 10.27.122.58 [Err] [HydraPlugin.cc:132] Unable to find Razer device [Wrn] [Event.cc:87] Warning: Deleteing a connection right after creation. Make sure to save the ConnectionPtr from a Connect call [Wrn] [Publisher.cc:140] Queue limit reached for topic /gazebo/default/user_camera/pose, deleting message. This warning is printed only once.