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[rospy.core][INFO] 2018-11-28 10:57:04,824: signal_shutdown [atexit]
So your core is receiving a shutdown signal. Hard to say what is exactly happening. Maybe check if their is still something running in the background that might be cause the shutdown. This error only occurs while running the simulation? Maybe try to start gazebo without the simulation and see if it runs.
Also it shutsdown after loading the model, so maybe try to run with different model and see what happens.