iPad publish errors

I'm using Flash CS5.5 with AIR 2.7 for iOS to publish an iPad app (*.ipa).

The first time I publish a file, everything's fine. But once an ipa has been published, every new publish attempt gives errors. Also, when I delete the ipa file, it will magically reappear in my file browser (without doing anything).

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Error creating files.

Unknown error.
unexpected failure: [ipa file path](Access is denied)
java.io.FileNotFoundException: [ipa file path](Access is denied)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at com.adobe.ucf.Utils.copyTo(Utils.java:40)
    at com.adobe.ucf.Packager.renameOutput(Packager.java:281)
    at com.adobe.air.ApplicationPackager.createPackage(ApplicationPackager.java:89)
    at com.adobe.air.ipa.IPAPackager.createPackage(IPAPackager.java:173)
    at com.adobe.air.ADT.parseArgsAndGo(ADT.java:511)
    at com.adobe.air.ADT.run(ADT.java:368)
    at com.adobe.air.ADT.main(ADT.java.418)

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Any ideas?