Together with all my other plugins I added this one:

#include <gazebo/plugins/CameraPlugin.hh>
using namespace std;

namespace gazebo
{
  class RobotCameraPlugin : public CameraPlugin
  {

    public: RobotCameraPlugin(): CameraPlugin()
    {
    }

    public: virtual ~RobotCameraPlugin()
    {
    }

    public: void Load(sensors::SensorPtr _sensor, sdf::ElementPtr _sdf)
    {
    }

    private: void Init()
    {
    }

  };

  // Register this plugin with the simulator
  GZ_REGISTER_SENSOR_PLUGIN(RobotCameraPlugin)
}

No matter what I do, I always get this error:

 [Err] [Plugin.hh:180] Failed to load plugin librifsimulator_camera.so: librifsimulator_camera.so: cannot open shared object file: No such file or directory

The file exists in the /home/peter/catkin_ws/devel folder.

I tried to isolate the problem by using only the bare code as shown above and a basic world file:

<?xml version="1.0" ?>
<sdf version="1.6">
  <world name="default">

    <include>
        <uri>model://ground_plane</uri>
    </include>

    <include>
        <uri>model://sun</uri>
    </include>

  <plugin name="rifsimulator_camera" filename="librifsimulator_camera.so"/>

  </world>
</sdf>

but the problem still exists. I already created a new catkin_ws folder, but without any effect. Any idea what's happening?

Thanks, Peter