While I was working in motion layout. I got an error saying
Attempt to invoke virtual method 'int androidx.constraintlayout.motion.widget.MotionScene$Transition.getStartConstraintSetId()' on a null object reference
Attempt to invoke virtual method 'int androidx.constraintlayout.motion.widget.MotionScene$Transition.getStartConstraintSetId()' on a null object refer
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In the MotionScene I was not writing the spelling of Transition properly. As you can see in line number 107 i was writing Transitionr instead of Transition.