content  of The application-content.xml is 
<?xml version="1.0" encoding="utf-8"?>
<objects xmlns="http://www.springactionscript.org/schema/objects"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://www.springactionscript.org/schema/objects
                              http://www.springactionscript.org/schema/objects/spring-actionscript-objects-1.0.xsd">

  <property file="strings.properties" />

  <object id="string1" class="String"/>
  <object id="string2" class="String"/>
  <object id="nlslzf" class="com.sgb.model.MyClass"/>  

 </objects>

content of strings.properties is:

s1=Firststring
s2=Secondstring

but error:

Main Thread (Suspended: Error: An object definition for 'string1' was not found.)   
    			org.springextensions.actionscript.ioc.factory.support::AbstractObjectFactory/getObject	
    			SpringActionScript/test	
    			SpringActionScript/onCreationComplete	
    			SpringActionScript/___SpringActionScript_Application1_creationComplete	
    			flash.events::EventDispatcher/dispatchEventFunction [no source]	
    			mx.core::UIComponent/dispatchEvent	
    			mx.core::UIComponent/set initialized	
    			mx.managers::LayoutManager/doPhasedInstantiation	
    			Function/http://adobe.com/AS3/2006/builtin::apply [no source]	
    			mx.core::UIComponent/callLaterDispatcher2	
    			mx.core::UIComponent/callLaterDispatcher2	
    			mx.core::UIComponent/callLaterDispatcher

i can run normal if removed the '' why it is? springactionscript bug?