Unable to launch a simulation that was working

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Hi everyone, I have an issues with my PX4 simulation since Friday, I am unable to have a working simulation, I did not remember to have made any change, but now, when I am launching my simulation, I don't get the px4 command prompt. So, I reinstall everything, but it did not work.

I found some errors inside my logfile, but I didn't find answer for them.

[rospy.client][INFO] 2018-11-28 10:57:04,270: init_node, name[/uav3/iris_3_spawn], pid[26431]
[xmlrpc][INFO] 2018-11-28 10:57:04,270: XML-RPC server binding to 0.0.0.0:0
[xmlrpc][INFO] 2018-11-28 10:57:04,271: Started XML-RPC server [http://projetd-VirtualBox:34009/]
[rospy.impl.masterslave][INFO] 2018-11-28 10:57:04,271: _ready: http://projetd-VirtualBox:34009/
[xmlrpc][INFO] 2018-11-28 10:57:04,272: xml rpc node: starting XML-RPC server
[rospy.registration][INFO] 2018-11-28 10:57:04,273: Registering with master node http://localhost:11311
[rospy.init][INFO] 2018-11-28 10:57:04,274: ROS Slave URI: [http://projetd-VirtualBox:34009/]
[rospy.init][INFO] 2018-11-28 10:57:04,274: registered with master
[rospy.rosout][INFO] 2018-11-28 10:57:04,274: initializing /rosout core topic
[rospy.rosout][INFO] 2018-11-28 10:57:04,296: connected to core topic /rosout
[rospy.simtime][INFO] 2018-11-28 10:57:04,310: initializing /clock core topic
[rospy.simtime][INFO] 2018-11-28 10:57:04,337: connected to core topic /clock
[rospy.internal][INFO] 2018-11-28 10:57:04,344: topic[/clock] adding connection to [http://projetd-VirtualBox:38481/], count 0
[rosout][INFO] 2018-11-28 10:57:04,393: Loading model XML from ros parameter
[rosout][INFO] 2018-11-28 10:57:04,430: Waiting for service /gazebo/spawn_urdf_model
[rosout][INFO] 2018-11-28 10:57:04,461: Calling service /gazebo/spawn_urdf_model
[rospy.internal][INFO] 2018-11-28 10:57:04,543: topic[/rosout] adding connection to [/rosout], count 0
[rosout][INFO] 2018-11-28 10:57:04,822: Spawn status: SpawnModel: Successfully spawned entity
[rospy.core][INFO] 2018-11-28 10:57:04,824: signal_shutdown [atexit]
[rospy.internal][INFO] 2018-11-28 10:57:04,839: topic[/rosout] removing connection to /rosout
[rospy.internal][INFO] 2018-11-28 10:57:04,840: topic[/clock] removing connection to http://projetd-VirtualBox:38481/
[rospy.impl.masterslave][INFO] 2018-11-28 10:57:04,840: atexit

By launching my simulation with : roslaunch px4 multi_uav_mavros_sitl.launch verbose:=true I have this error in output :

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