Problem with gwt-connector

[sony]

Hello,

I am using gwt-connector for my project and i am trying to create new
connector each time a button is clicked. Here is the code:

public class ERD1 implements EntryPoint {

public void onModuleLoad() {

AbsolutePanel boundaryPanel = new AbsolutePanel();
boundaryPanel.setPixelSize(1000, 1000);

final Diagram d = new Diagram(boundaryPanel);

Button b = new Button();
b.addClickListener(new ClickListener(){

@Override
public void onClick(Widget sender) {
SectionDecoration startDecoration = new SectionDecoration
(SectionDecoration.DECORATE_ARROW);
SectionDecoration endDecoration = new SectionDecoration
(SectionDecoration.DECORATE_ARROW);

Connector con = new Connector(10, 10, 10, 10, startDecoration,
endDecoration);
con.showOnDiagram(d);
}

});

boundaryPanel.add(b, 10, 40);

RootPanel.get().add(boundaryPanel);
}
}

but when i click on the button i am getting the following error:

[ERROR] Uncaught exception escaped
java.lang.IllegalArgumentException: Sections must be horizontal or
vertical!
at pl.tecna.gwt.connectors.client.Section.<init>(Section.java:44)
at pl.tecna.gwt.connectors.client.Connector.recreateSections
(Connector.java:226)
at pl.tecna.gwt.connectors.client.Connector.showOnDiagram
(Connector.java:162)
at com.e.r.d.client.ERD1$1.onClick(ERD1.java:45)
at com.google.gwt.user.client.ui.ListenerWrapper
$WrappedClickListener.onClick(ListenerWrapper.java:245)
at com.google.gwt.event.dom.client.ClickEvent.dispatch
(ClickEvent.java:54)
at com.google.gwt.event.dom.client.ClickEvent.dispatch
(ClickEvent.java:1)
at com.google.gwt.event.shared.HandlerManager
$HandlerRegistry.fireEvent(HandlerManager.java:65)
at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.access$1
(HandlerManager.java:53)
at com.google.gwt.event.shared.HandlerManager.fireEvent
(HandlerManager.java:178)
at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:52)
at com.google.gwt.event.dom.client.DomEvent.fireNativeEvent
(DomEvent.java:116)
at com.google.gwt.user.client.ui.Widget.onBrowserEvent(Widget.java:
90)
at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1320)
at com.google.gwt.user.client.DOM.dispatchEventAndCatch(DOM.java:
1299)
at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1262)
at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:
103)
at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod
(IDispatchImpl.java:126)
at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke
(IDispatchProxy.java:155)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke
(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6
(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6
(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.SwtHostedModeBase.processEvents
(SwtHostedModeBase.java:264)
at com.google.gwt.dev.HostedModeBase.pumpEventLoop
(HostedModeBase.java:557)
at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

please can anyone tell me what is going wrong.
Thank you.