[JAVA3D] JAVA3D && NT

[Edith]

hello, everybody!!! I have problems again, I am trying see my java3D applet on the IE browser on NT, but after load the applet i recieve the following error message in the java console of Java Plug in   javax.media.j3d.MultipleParentException: Group.addChild: child already has a parent  at javax.media.j3d.GroupRetained.checkValidChild(GroupRetained.java:374)  at javax.media.j3d.GroupRetained.addChild(GroupRetained.java:383)  at javax.media.j3d.Group.addChild(Group.java:261)  at Tesis7.AppletCity.initUniverse(AppletCity.java:391)  at Tesis7.AppletCity.jbInit(AppletCity.java:300)  at Tesis7.AppletCity.init(AppletCity.java:99)  at sun.applet.AppletPanel.run(Unknown Source)  at java.lang.Thread.run(Unknown Source)   Can anyone please tell me what I should do to solve this problem?. Thanks & Regards Edith