I have been working with the same codebase for some time. Today I added a library (bashi/exif-as3 · GitHub to get over https://forums.adobe.com/message/381400 this issue). As soon as I had added that library in, I'm getting PackageExtractionFailed errors.
I'm authoring in Flash CC 2015. AIR 19.0.0.193. iOS9 Platform - Windows 7.
I wish there were more info about what this error actually meant so there was a natural line of inquiry.
Things I've tried:
* The library comes with a bunch of XML files that are EMBEDded into the Tags.as class. I thought this might be a natural place to start, but removing those embedded XML files doesn't stop the error.
* The situation is extremely unstable. After removing the library, the error persisted until I backed up significantly further. Then, interestingly, adding pieces back in (that had previously also thrown the error) no longer failed.
* Restarting the iPad, restarting the PC seemed to have no effect, nor did clearing the Publish cache.
* After 5 hours of trial and error I am unable to determine the cause. this is affecting shipping code, but I have no idea what else to try, maybe older AIR versions or an iOS8 device?