Error while launching gazebo

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I had imported point cloud data into CloudCompare and generate a mesh from it. Later I had Exported the model as a .dae (Collada object). Then, Imported the model into gazebo following this tutorial (http://gazebosim.org/tutorials/?tut=i...)

Now the error is

sai@sai-Blade:~/Desktop$ gazebo my_project.world escalating to SIGKILL on server

Any help is much appreciated. Thanks