Exception: Could not lanuch openfire

I run "ant clean": then delete openfire/target/ and openfire/work

then i run "ant openfire"

but when i run openfire

the Exception occure:

java.lang.NoClassDefFoundError: org/jivesoftware/openfire/starter/ServerStarter

Caused by: java.lang.ClassNotFoundException: org.jivesoftware.openfire.starter.S

erverStarter

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

Exception in thread "main"

how to deal with this?thank you

I see the openfire.jar ,I didn't find the org.jivesoftware.openfire.starter.ServerStarter.class