What is wrong with this code? VBA

The value of the cell is always "error" no matter if the condition is true or not. I've tried using else but it doesn't work either.

Sub ejer_4()
    Cells(3, 1).Value = "hola"
    For i = 2 To 21:
        If Int(Cells(i, 3).Value) <> Int(Cells(i + 1, 3).Value) - 1 Then
            Cells(3, 1).Value = "Error"
        End If
    Next
End Sub