Why am I getting a TypeError: document.querySelector(...) is null in my JavaScript code?

Why am I getting a TypeError: document.querySelector(...) is null in my JavaScript code?

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Why Am I Getting "Uncaught TypeError: Cannot Read Property of Null" in My Tic Tac Toe JS Code?
Why Am I Getting "Uncaught TypeError: Cannot Read Property of Null" in My Tic Tac Toe JS Code?
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