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Hello guys , solved this problem by myself. The problem was there are to messages.

I made the mistake with :

sub = rospy.Subscriber("/gazebo/ModelStates",ModelState,newModel)

the correct one is :

sub = rospy.Subscriber("/gazebo/model_states",ModelStates,newModel)

Fixing this solved the error and i can run my program now without any problems

Hello guys , solved this problem by myself. The problem was there are to messages.

I made the mistake with :

sub = rospy.Subscriber("/gazebo/ModelStates",ModelState,newModel)rospy.Subscriber("/gazebo/ModelStates",ModelState,newModel)

the correct one is :

sub = rospy.Subscriber("/gazebo/model_states",ModelStates,newModel)rospy.Subscriber("/gazebo/model_states",ModelStates,newModel)

Fixing this solved the error and i can run my program now without any problems