One or more ImageType values are invalid.
For a list of valid values, see http://sellercentral.amazon.com/gp/help/25581
One of more of the values you supplied for ImageType in your product image data feed is invalid. The valid values are:
PT1 through PT8 are used to indicate alternate views of your main product image. For more information on the different types of product images that can be specified in a product image data feed, visit Images Feed Overview