~~ PLEASE HELP! Someone from Appcelerator ~~ Fail to package Android Module

After upgrade to Ti Studio's latest build v3.4.1.201410281727, I can no longer package my Android Project which used to be packaged successfully using earlier build.

Even create a new Mobile Module project from scratch, it cannot be packaged either.

After select 'Package' > select 'Output Location' > 'Finish', it always prompt exception dialog saying:

Exception occurred during launch
Reason: 
Error within Debug UI:

When click on Details, it shows:

Java.lang.reflect.InvocationTargetException

I am developing on Mac OSX 10.9.5 and have android SDK 20 installed. Seems this is a known issue and should have been fixed since build v3.3.0 but I am still encounter such problem. Is it a regression bug????

Hope someone from Appcelerator CAN HELP???

Or does anyone can successfully build an Android Module using latest Ti Studio? Could you share with me your project configuration?

Many thanks.