Flex 3: Error #1069 on Embedded Google Map

I've got a Flex 3 app (a Google map) embedded in a WordPress page. It's been working fine for a few weeks. I just went to check the page, and I got the following error message:

Refe开发者_Python百科renceError: Error #1069: Property at not found on com.adobe.serialization.json.JSONParseError and there is no default value. at 
com.google.maps.core::UsageTracker/onLoadComplete()

Any ideas as to what this means and how to fix it? I didn't know that I was using JSON.

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AS3 error 1069 appears when you have misspelled a property or function and have not assigned a value to it.

From http://curtismorley.com/2008/07/16/365/

Wrong:

var t = new Timer(1000, 60);
t.addEvent(TimerEvent.TIMER, Tick);

Correct:

var t = new Timer(1000, 60);
t.addEventListener(TimerEvent.TIMER, Tick);