Error occurred while packaging the application: Index: 32, Size: 32

I'm getting a strange error when trying to package my iOS App to Device:

I can create a package from ANT, but trying to Debug from FlashBuilder, or Export Release Build, gives me the error above.

Digging into the log gives me this:

!MESSAGE Error occurred while packaging the application:

Index: 32, Size: 32

!STACK 0

java.lang.IndexOutOfBoundsException: Index: 32, Size: 32

  at java.util.ArrayList.RangeCheck(Unknown Source)

  at java.util.ArrayList.get(Unknown Source)

  at com.adobe.flexbuilder.project.air.export.AbstractFilePackager.getPresentParameterIndex(AbstractFilePackager.java:371)

  at com.adobe.flexbuilder.project.air.export.AbstractFilePackager.processAdditionalCommands(AbstractFilePackager.java:326)

  at com.adobe.flexide.multiplatform.ios.packaging.IPAPackager.create(IPAPackager.java:161)

  at com.adobe.flexbuilder.project.air.export.AIRPackageParameterModificationHandler.handleModifiedPackaging(AIRPackageParameterModificationHandler.java:236)

  at com.adobe.flexide.multiplatform.ios.launching.IOSLaunchHandler.doPackage(IOSLaunchHandler.java:679)

  at com.adobe.flexide.multiplatform.ios.launching.IOSLaunchHandler.launch(IOSLaunchHandler.java:255)

  at com.adobe.flexide.launching.multiplatform.MultiPlatformLaunchDelegate.launch(MultiPlatformLaunchDelegate.java:184)

  at com.adobe.flexide.launching.AbstractFlexLaunchDelegate.launch(AbstractFlexLaunchDelegate.java:244)

  at com.adobe.flexide.launching.AbstractFlexLaunchDelegate.launch(AbstractFlexLaunchDelegate.java:134)

  at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:854)

  at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703)

  at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:928)

  at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1132)

  at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Some notes:

* The values for Index, vary from 29 to 32

* Tried both Fast / Standard compile, no difference

* Tried useLegacyAOT, no difference

* Tried AIR SDKs 18 and 20, no difference

Any Ideas?