Solution to "Problem using as3corelib and HTTService"

I encountered this error message in one of my AIR projects.

VerifyError: Error #1053: Illegal override of concurrency in mx.rpc.http.mxml.HTTPService.

It looks like the same error as the one described in:
http://forums.adobe.com/thread/681351?tstart=0

Steps to reproduce:
This occurs after I download as3corelib.swc 0.93 and put in my Flex project's libs folder.  Inside my app, there is an mx:HttpService.
It looks like some sdk incompatibility.

Solution:
Instead of putting downloaded as3corelib.swc into libs folder.  Copy and paste as3corelib source code into your own project.  You can download the source code by using svn from http://as3corelib.googlecode.com/svn/trunk/

For example, I only use JSON library.  So I just need to copy com.adobe.serialization.json folder to my project.