Compile Error - Expected Array

I keep getting a "Compile Error - Expected Array" error message at

prompt = "How many text lines will unique product number " & ModifyUniqueProduct & " have?"
Caption = "Modify Customer Order Information"
Default = 1
ReDim ModifyNumberofProductLines(Val(InputBox(prompt, Caption, Default)) - 1)

What have I coded incorrectly?

Thanks!

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