I lost the memory stick and bought another one and when I insert read error

You must get a lavender colored sony stick. the black sticks will not work on older sonys. they do make them and only go up to 128 mb usually around 20 dollars.

Perhaps the card is not properly formatted for reading by the camera. You can try formatting the card directly through the camera (open the menu, look under card settings, then format data) or doing it directly through a computer with a card reader. If neither of those work, then it could be a bum card. Take it back to the retailer with the original packaging and a receipt and tell them that it doesn't work. If they want to charge you a stocking fee, argue that the product was defective and you had no way of knowing until you opened it.