使用flex4问题求助！！

<?xml version="1.0" encoding="utf-8"?>
<application xmlns:fx="http://ns.adobe.com/mxml/2009" 
 xmlns:s="library://ns.adobe.com/flex/spark"  
 xmlns:mx="library://ns.adobe.com/flex/mx"min_size >
<fx:Declarations>

</fx:Declarations>
</application>

Element type "application" must be followed by either attribute specifications, ">" or "/>".flexJ2ee.mxml/flexJ2ee/srcline 4Flex Problem

这个是肿么回事？？？求大神帮忙啊
flex mxml
[解决办法]
xmlns:mx="library://ns.adobe.com/flex/mx"min_size >

最后那个min_size你要给它一个值吧。