[Solved] I am confused on purpose of using “Not”, also on matching of “If” criteria, code says “is nothing” else run code for “MsgBox”

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I am confused on purpose of using “Not”, also on matching of “If” criteria, code says “is nothing” else run code for “MsgBox”

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solved I am confused on purpose of using “Not”, also on matching of “If” criteria, code says “is nothing” else run code for “MsgBox”