I can't deliver app to AppStore ("This bundle is invalid.")

[James Little]

> I keep getting errors about splash screens not being the right format. I tried changing that and it's not working. I'm using Livecode 6.6 and Xcode 5.1.
> 
> These are the errors from Application Loader:
> "Apple's web service operation was not successful
> Unable to authenticate the package: 588503985.itmsp
> ERROR ITMS-9000: "This bundle is invalid. The icon file Smoothie.app/Default-Landscape.png must be in .png format." at SoftwareAssets/SoftwareAsset (MZItmspSoftwareAssetPackage)
> ERROR ITMS-9000: "This bundle is invalid. The icon file Smoothie.app/Default-Landscape at 2x.png must be in .png format." at SoftwareAssets/SoftwareAsset (MZItmspSoftwareAssetPackage)
> Could not start delivery: all transports failed diagnostics"
> 
> Any ideas?