The Iris_arducopter_runway.world exists and has been set to path but still when command -” gazebo –verbose ~/ardupilot_gazebo/worlds/iris_arducopter_runway.world” is given it opens an empty.world. This is my log….
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Gazebo multi-robot simulator, version 11.10.2
Copyright (C) 2012 Open Source Robotics Foundation.
Released under the Apache 2 License.
http://gazebosim.org