problems with ant installation

[vidu mayur]

Hi
I downloaded the ant nightly build apache ant alpha1.6 and changed the environment variables to
path %ANT_HOME%\bin;%JAVA_HOME%\bin
JAVAHOME: C:\j2sdk1.4.2_01
classpath C:\ant\lib\ant.jar;C:\ant\lib\xercesImpl.jar;C:\ant\lib\xml-apis.jar
ANT_HOME c:\ant
When I run ant from C:\ant\bin, I get this error
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/Launcher
Please help me
Thanks
Vidu