What is this "Unable to find named traits" error in Adobe AIR?

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Exception in thread "main" java.lang.Error: Unable to find named traits: com.chartboost.plugin.air::Chartboost

If you get an error similar to this while building your application, it usually indicates that the AIR native extension was not packaged properly. Make sure you've included this plugin's extension ID in your application descriptor XML file. Also verify that when you export a build, the Chartboost ANE is being packaged with your application.