Can´t remove REMEMBOT

Hi there,

I installed this plugin, and after this, all user take soooo long to appear online when they login …

I tried to remove it by openfire plugins tab, but i got this msg:

"HTTP ERROR: 500

org.jivesoftware.openfire.SessionManager.broadcast(Lorg/xmpp/packet/Packet;)V

RequestURI=/plugin-admin.jsp

Caused by:

java.lang.NoSuchMethodError: org.jivesoftware.openfire.SessionManager.broadcast(Lorg/xmpp/packet/Packet;)V
     at net.smilingj.openfire.plugin.remembot.RememBot.destroyPlugin(RememBot.java:56)
     at org.jivesoftware.openfire.container.PluginManager.unloadPlugin(PluginManager.java:558)
     at org.jivesoftware.openfire.admin.plugin_002dadmin_jsp._jspService(plugin_002dadmin_jsp.java:122)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
     at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
     at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:65)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:41)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:69)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:98)
     at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
     at org.mortbay.jetty.Server.handle(Server.java:313)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
     at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

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How can i fix it ?

***Tks !!