# Error with plugins associated with Ignition Robotics models

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Hi guys, I'm having troubles with introducing in my .world file a model found in Ignition Robotics. I am using Gazebo 11.2.0. In my case, I would introduce a some rocks in my world (the name of the model is Small Rock Fall). I searched for some hint and I've read that there is the possibility to introduce the model by using the following sintax:

<include>
<uri>https://fuel.ignitionrobotics.org/1.0/OpenRobotics/models/Small Rock Fall</uri>
</include>


However, if I load the .world file I get the following error message:

 [Msg] Downloaded model URL:
https://fuel.ignitionrobotics.org/1.0/OpenRobotics/models/Small Rock Fall
to:
/home/simone/.ignition/fuel/fuel.ignitionrobotics.org/OpenRobotics/models/Small Rock Fall/2
Warning [Model.cc:212] Non-unique names detected in XML children of model with name[small_rock_fall].
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory
[Err] [Plugin.hh:178] Failed to load plugin libignition-gazebo-breadcrumbs-system.so: libignition-gazebo-breadcrumbs-system.so: cannot open shared object file: No such file or directory


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I was using the 11.0.0 version. I have now upgraded it to the 11.2.0 and the model "Falling rock 1" can now be introduced through the "uri". Thanks a lot! However, I still experience problem models using plugins, such as the "Medium rock fall". Can you try to include it in a .workd file and tell whether you have problems with it, please? The needed lines are the following.