FlexBuilder beginner question

I am getting the following error when I tried my first flex project.  Can you please help to resolve.

Process terminated unexpectedly.

invalid application descriptor: Unknown namespace: http://ns.adobe.com/air/application/2.7


Launch command details:  "C:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\4.5.1\bin\adl.exe" -runtime "C:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\4.5.1\runtimes\air\win" C:\flash_workspace\learna\bin-debug\First-app.xml
 C:\flash_workspace\learna\bin-debug
ambuliAsked:
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dgofmanCommented:
Can you try to change in desription file an AIR version

<application xmlns="http://ns.adobe.com/air/application/2.0">
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ambuliAuthor Commented:
Thanks.  I tried att -version and it reported 2.6.0.19120.  So, I changed the namespace to
<application xmlns="http://ns.adobe.com/air/application/2.6"> and it seems to be working.  But, the problem is I don't see any dialogs displayed.  But, when I tried to run, it says that the application is already running.  This was an example that I am trying out.

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx">
	<fx:Script>
		<![CDATA[
			[Bindable]
			private var textSize:Number = 24;
			private function changeSize():void
			{
				textSize = mySlider.value;
			}
		]]>
	</fx:Script>

	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<s:Panel id="myPanel" x="381" y="130" width="503" height="400">
		<s:Label id = "myLabel" x="149" y="32" text="Hello Flex" fontSize="{textSize}"/>
		<s:Button x="149" y="213" label="Good Bye" click="myPanel.visible=(false)"/>
		<s:HSlider id="mySlider" x="149" y="111" change="changeSize()" maximum="72" minimum="10"/>
	</s:Panel>
</s:WindowedApplication>

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