Type '[component name]' in CSS selector '[component name]' must be qualified with a namespace

Question

I've recently upgraded my SDK to allow me encorporate other features such as the Text Layout Framework and such. To avoid issues i've had to make Flash player 10 as required, which is where the problems are occuring in my main project.
We knew the switch would cause some issues, and we now have a lovely batch of 100+ Warnings, that are all along the lines of
Type '[component name]' in CSS selector '[component name]' must be qualified with a namespace
all the warnings are on line locations that have no reference to the component they are talking about.. so i'm kinda stumped on what to do. Anybody else run into this issue before?
cheers

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/halo"  >
<fx:Style>
@namespace s "library://ns.adobe.com/flex/spark";
@namespace mx "library://ns.adobe.com/flex/halo";
Button
    // The warning
</fx:Style>
<s:Button label="提交"  textAlign="center" height="30"/>
</s:Application>
I think you have use flex4.
Please change the code to :
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
      xmlns:s="library://ns.adobe.com/flex/spark"
      xmlns:mx="library://ns.adobe.com/flex/halo"  >
<fx:Style>
@namespace s "library://ns.adobe.com/flex/spark";
@namespace mx "library://ns.adobe.com/flex/halo";
s|Button
    // ok. The is style for spark button }
mx|Button
    //ok. The is style for halo button
</fx:Style>
<s:Button label="提交"  textAlign="center" height="30"/>
</s:Application>