RaySystemError: Ray has not been started yet. You can start Ray with 'ray.init()'

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System error: Ray has not been started yet. You can start Ray with ‘ray.init()’
I am trying to run NYC data exmaple, ray init is working, i can do ds.count()
but when i do ds.take(1), or iterate over it. it says System error: Ray has not been started yet. You can start Ray with ‘ray.init()’.

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