             var toValue:Object = null;
             
             if (!property || (property == ""))
-                throw new Error("Illegal property value: " + property);
+                throw new Error(resourceManager.getString("sparkEffects", "illegalPropValue", [property]));
                  
             setupStyleMapEntry(property);
 

                }
                catch (err:Error)
                {
                    throw new Error("Property " + property + " is neither " +
                        "a property or a style on object " + target + ": " + err);
                }
                // TODO: check to make sure that the throw above won't
                // let the code flow get to here

    private var reverseAnimation:Boolean;
    
    private var needsRemoval:Boolean;
    
    /**
     *  @private
     *  Used for accessing localized Error messages.
     */
    private var resourceManager:IResourceManager =
                                    ResourceManager.getInstance();
    
    //--------------------------------------------------------------------------
    //
