[Using Sakai] regarding making anew tool in sakai

[sangeeta bishnoi]

Hi..

i have been created the tool by using the maven archetype according to the
information given in this following link

http://pmungai.wordpress.com/sakai-developer-guide/

my tool is visible in sakai tools but after adding this tool in a site when
i click on this tool then following error is occur so now what i do plz
suggest me.



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Technical Details

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org.sakaiproject.portal.api.PortalHandlerException:
org.apache.wicket.WicketRuntimeException: Can't instantiate page using
constructor public org.sakai.sangeeta.tool.pages.FirstPage()
    at org.sakaiproject.portal.charon.SkinnableCharonPortal.doGet(SkinnableCharonPortal.java:862)
caused by: org.apache.wicket.WicketRuntimeException: Can't instantiate
page using constructor public
org.sakai.sangeeta.tool.pages.FirstPage()
    at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:97)
caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
caused by: java.lang.NoClassDefFoundError: Lorg/sakai/sangeeta/logic/SakaiProxy;
    at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
caused by: java.lang.ClassNotFoundException: org.sakai.sangeeta.logic.SakaiProxy
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1438)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2291)
    at java.lang.Class.getDeclaredFields(Class.java:1743)
    at org.apache.wicket.injection.Injector.findFields(Injector.java:161)
    at org.apache.wicket.injection.Injector.getFields(Injector.java:139)
    at org.apache.wicket.injection.Injector.inject(Injector.java:87)
    at org.apache.wicket.injection.ConfigurableInjector.inject(ConfigurableInjector.java:39)
    at org.apache.wicket.injection.ComponentInjector.onInstantiation(ComponentInjector.java:52)
    at org.apache.wicket.Application.notifyComponentInstantiationListeners(Application.java:1093)
    at org.apache.wicket.Component.<init>(Component.java:923)
    at org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:113)
    at org.apache.wicket.MarkupContainer.<init>(MarkupContainer.java:105)
    at org.apache.wicket.Page.<init>(Page.java:239)
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