ClassCastException in Subscription Plugin

I installed the Subscription Plugin but it doesn’t seem to be having any effect. I set it to accept all.

The log shows a ClassCastException:

2010.03.01 15:37:18 [org.jivesoftware.openfire.container.PluginServlet.service(PluginServlet.java:9 9)
]
java.lang.ClassCastException: org.jivesoftware.openfire.plugin.SubscriptionPlugin cannot be cast to org.jivesoftware.openfire.plugin.SubscriptionPlugin
at org.jivesoftware.openfire.plugin.subscription.subscription_002dplugin_002dprope rties_jsp._jspService(subscription_002dplugin_002dproperties_jsp.java:58)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.jivesoftware.openfire.container.PluginServlet.handleJSP(PluginServlet.java: 229)
at org.jivesoftware.openfire.container.PluginServlet.service(PluginServlet.java:87 )
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1093)
at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:70)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:146)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:11 8)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:66)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingF ilter.java:42)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:70)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va:1084)
at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:146)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.ja va: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:726)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollect ion.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.j ava:829)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)

I’ve tried restarting Openfire, and removing and reinstalling the plugin, with no luck. I’m running Openfire 3.6.4 and Subscription Plugin 1.2.0.