java.lang.ClassCastException: java.lang.OutOfMemoryError

Applet won´t show; stacktrace;
running local on the server
http://localhost/web-console/Invoker
java.lang.ClassCastException: java.lang.OutOfMemoryError
at org.jboss.console.remote.Util.invoke(Util.java:80)
at org.jboss.console.remote.AppletRemoteMBeanInvoker.invoke(AppletRemoteMBeanInvoker.java:50)
at org.jboss.console.navtree.ConsoleTreeModel.loadTree(ConsoleTreeModel.java:104)
at org.jboss.console.navtree.ConsoleTreeModel.<init>(ConsoleTreeModel.java:59)
at org.jboss.console.navtree.AdminTreeBrowser.<init>(AdminTreeBrowser.java:63)
at org.jboss.console.navtree.AppletBrowser.start(AppletBrowser.java:51)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)