runtime error 1004 numberformat of range

Hi Excel Forum,

I have just recently started learning about vba and macros.

Currently, I am creating a macro to auto-input a date & time stamp(on a2) once another value has been placed on another cell(b2), with the help of a video from Youtube I am able to make the idea partly work.

I am encountering an error: "runtime error 1004 numberformat of range"

here is my macro(on "worksheet" & "change" dropdown):

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Any corrections & suggestions to make my sheet work will be great!

#Edit:

By the way the sheet is unlocked.

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