Code no longer producing values

[ajc5382]

Below is the code
rngvol is the number of volatility days(much like a 30 day moving average is over the previous 30 days)
volcalc is the number of rows of data in the given column

'Statistical Volatility Calculation 1




rngvol = Worksheets("config").Cells(32, 2)
volcalc = WorksheetFunction.CountA(Sheets("INFO").Range("A:A"))

Do Until Worksheets("info").Cells(rngvol + i + 1, 1).Value = ""
For i = 1 To volcalc - rngvol + 1
cor1 = WorksheetFunction.StDev(INFO.Range(INFO.Cells(2 + i, 4), INFO.Cells(rngvol + i + 1, 4)).Value)
volatility1 = cor1 * Worksheets("config").Cells(38, 2).Value
Worksheets("info").Cells(rngvol + i + 1, 8).Value = volatility1

Next i
Exit Do

Loop

[shg]

What is INFO and how is it initialized?

Would you please be so kind as to put your code in CODE tags?