hi all!
i have installed xwiki on my Linux machine.
When I try to register an user I receive this error : 

HTTP ERROR 500

Problem accessing /xwiki/bin/register/XWiki/Register. Reason:

    Could not initialize class com.xpn.xwiki.web.RegisterAction
Caused by:

java.lang.NoClassDefFoundError: Could not initialize class
com.xpn.xwiki.web.RegisterAction
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
        at java.lang.Class.newInstance0(Class.java:372)
        at java.lang.Class.newInstance(Class.java:325)
        at
org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:143)
        at
org.apache.struts.action.RequestProcessor.processActionCreate(RequestProcessor.java:292)
        at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:230)
        at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:669)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1448)
        at com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:121)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at
org.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(ConversionFilter.java:144)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at
com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:66)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at
org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:208)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at
org.xwiki.container.servlet.filters.internal.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:111)
        at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
        at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
        at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
        at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
        at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
        at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
        at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
        at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
        at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
        at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
        at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
        at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
        at org.eclipse.jetty.server.Server.handle(Server.java:368)
        at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:488)
        at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:932)
        at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:994)
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
        at
org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
        at
org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628)
        at
org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
        at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
        at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
        at java.lang.Thread.run(Thread.java:722)


why???



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