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Error uploading textbook to Apple store

I have a problem uploading my textbook I created with the iBook creator... whenever I use iTunes producer I get given this error message

ERROR ITMS-4064: "Unsupported extension 'PNG' for artwork asset type." at Book (MZItmspBookPackage)

I tried converting all the images to .jpeg and it isn't working... what do I do?

iPad 2, iOS 5.0.1

Posted on Feb 1, 2012 1:22 PM

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Error uploading textbook to Apple store

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