JAVASCRIPT

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Error "TypeError: Cannot read property 'classList' of null"

Hello, I am trying when simple code to add datepicker in javascript using below HTML and Javascript Code, but I am getting error "TypeError: Cannot read property 'classList' of null", how can I resolve it?

cannot-read-properties-of-null-reading-classlist-min_sgpbi5.png

HTML/JS Code

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Question
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