Problem: Adding ejb jar

[Veronica Hiller]

Hello, I new in J2EE technolgy. I try deploy the application, the sample application Converter.
I do the instructions, but when I start the deployment, Error.
The message display this:
----------- Exception -----------------------------------------------------
ERROR: [DeployToolWindow.addEjbJar:1688]
Adding EJB JAR
java.lang.RuntimeException: Class loader could not be made
---------------------------------------------------------------------------
java.lang.RuntimeException: Class loader could not be made
at com.sun.enterprise.deployment.ApplicationArchivist.getClassLoader(ApplicationArchivist.java:174)
at com.sun.enterprise.deployment.EjbBundleArchivist.getClassLoader(EjbBundleArchivist.java:58)
at com.sun.enterprise.deployment.EjbDescriptor.getMethodDescriptors(EjbDescriptor.java:1142)
at com.sun.enterprise.deployment.EjbDescriptor.classesChanged(EjbDescriptor.java:111)
at com.sun.enterprise.deployment.EjbBundleDescriptor.classesChanged(EjbBundleDescriptor.java:114)
at com.sun.enterprise.deployment.EjbBundleArchivist.updateFiles(EjbBundleArchivist.java:476)
at com.sun.enterprise.deployment.Archivist.addFiles(Archivist.java:218)
at com.sun.enterprise.deployment.ApplicationArchivist.addEjbJar(ApplicationArchivist.java:1173)
at com.sun.enterprise.tools.deployment.ui.DeployToolWindow.addEjbJar(DeployToolWindow.java:1684)
at com.sun.enterprise.tools.deployment.ui.DeployToolWindow.newEjbJarAction(DeployToolWindow.java:1600)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.invoke(UIActionDispatcher.java:258)
at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.invoke(UIActionDispatcher.java:276)
at com.sun.enterprise.tools.deployment.ui.utils.UIActionDispatcher.actionPerformed(UIActionDispatcher.java:296)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1767)
at com.sun.enterprise.tools.deployment.ui.utils.UIMenu$UIMenuItem.fireActionPerformed(UIMenu.java:216)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1820)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)
at javax.swing.AbstractButton.doClick(AbstractButton.java:289)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1092)
at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseReleased(BasicMenuItemUI.java:932)
at java.awt.Component.processMouseEvent(Component.java:5021)
at java.awt.Component.processEvent(Component.java:4818)
at java.awt.Container.processEvent(Container.java:1380)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1437)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3214)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2929)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2859)
at java.awt.Container.dispatchEventImpl(Container.java:1423)
at java.awt.Window.dispatchEventImpl(Window.java:1566)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at com.sun.enterprise.tools.deployment.ui.utils.UIEventQueue.dispatchEvent(UIEventQueue.java:214)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
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Thanks you for help