Error in defing history_data

https://trainings.boltiot.com/courses/429176/lectures/8593360

how should I define history_data

need the below code to debug keep the whole code

declare like
history_data=[ ]
before you are using it
better write this under mailer ine

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Thanks buddy it did work. Thanks a lot

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Your are welcome. :slight_smile::slight_smile::slight_smile: