arrow not works

[Wish000]

Hello!
My css like this:

edge {
    z-index: 1;
    arrow-shape: arrow;
    arrow-size: 20px;
}

node#A {
    z-index: 0;
    fill-color: red;
}

node#B {
    z-index: 0;
    fill-color: #FA0;
}

node#C {
    z-index: 0;
    fill-color: #04F;
}

but it shows without arrow(even if other shape "diamond" etc):

I've tried as https://github.com/graphstream/gs-core/issues/22 suggests, downloading the gs-ui.jar from http://litis.univ-lehavre.fr/~dutot/gs-ui.jar. However, a error is thrown.

Exception in thread "AWT-EventQueue-0" java.lang.AbstractMethodError: org.graphstream.ui.j2dviewer.J2DGraphRenderer.getCamera()Lorg/graphstream/ui/view/Camera;
	at org.graphstream.ui.swingViewer.DefaultView.getCamera(DefaultView.java:161)
	at org.graphstream.ui.view.Viewer.computeGraphMetrics(Viewer.java:575)
	at org.graphstream.ui.view.Viewer.actionPerformed(Viewer.java:545)
	at javax.swing.Timer.fireActionPerformed(Timer.java:313)
	at javax.swing.Timer$DoPostEvent.run(Timer.java:245)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

gs-core version 1.3
gs-ui version 1.3

I want to show my arrow on edges so that I can draw a dag.
Thanks!