I 'v tried to use SDK tool provided by Sencha to create Iphone and android build .

I followed exactly the same steps as mentioned in GETTING STARTED video by which i am able to create the GETTING STARTED Example IOS build but when i tried to create ANDROID build it displays following error in my windows 7 console.

PHP Code:
javacCompiling 3 source files to D:\tomcat\webapps\GS\build\native\bin\classes
[javac]  D:\tomcat\webapps\GS\build\native\src\com\mycompany\myAppID\STActivity.java:10:  cannot access com.sencha.nimblekit.NimbleKit
[javacbad class fileD:\tomcat\webapps\GS\build\native\libs\nimblekit.jar(com/sencha/nimblekit/NimbleKit.class)
javac] class file has wrong version 50.0should be 49.0
[javacPlease remove or make sure it appears in the correct subdirectory of the classpath.
javac]     private static NimbleKit nimblekit null;
javac]                    ^
javac1 error
""D:/Android/sdk17/tools/android" create project --target android-7  --name MyApplication --activity STActivity --path  "D:\tomcat\webapps\GS\build\native/" --package com.mycompany.myAppID"
Could not run ant with error1
Failed to package application
:\Android\sdk17\tools\ant\build.xml:651The following error occurred while executing this line:
D:\Android\sdk17\tools\ant\build.xml:672Compile failedsee the compiler error output for details

I really don't know y this error is there because i have no idea about nimble kit.

Please help me ASAP.

Sachin Sachdeva.