Transitioning scene and enabling a certain camera and disabling another one.

As you see in the screenshot below Im making a script where I transition from one scene to another and there are multiple cameras in that scene so when I trigger the collider it activates a certain camera in that scene and disables the other ones, therefore so I can have every interior in one scene and the city in the other scene. The problem is when I trigger the collider it gives me the message error that Object reference not set to an instance of an object when its supposed to be referenced by the void update gameobject find function.