Invalid namespace error occurs with Air SDK15.0

Hello,

I'm using Flash builder version 4.7 and updated AirSDK 4.0 to 15.0 following bellow instructions

Overlay AIR SDK on Flex SDK | Flash Builder

Update the AIR SDK for ActionScript Projects | Flash Builder 4.7

and now I'm getting below error when I run the adt command.

error 102: Invalid namespace

http://ns.adobe.com/air/application/15.0

I have changed the namespace in the project-app.xml file

<?xml version="1.0" encoding="utf-8" standalone="no"?>

<application xmlns="http://ns.adobe.com/air/application/15.0">

and changed the version number in ANE files

<?xml version="1.0" encoding="UTF-8"?>

<extension xmlns="http://ns.adobe.com/air/extension/15.0">

am I doing anything wrong?

please help