I've installed the CreateJS toolkit in Flash CS6, and I'm getting several "empty symbol" errors when try to publish the Flash file to HTML5 using the toolkit. Most of the symbols export fine -- it's just a handful that don't -- and I can't figure out why. (The symbols that work and the symbols that don't work are essentially essentially identical, and all of them were originally created as graphic symbols in Illustrator and then imported into the Flash library). The file exports fine as a SWF, but I need to convert it to HTML5 to include in an iPad app. Any tips you can offer would be greatly appreciated - thank you!