Openfire 3.8.0 Group Error

HTTP ERROR 500

Problem accessing /group-edit.jsp. Reason:

    Server Error
Caused by:

java.lang.UnsupportedOperationException
	at java.util.AbstractMap.put(Unknown Source)
	at org.jivesoftware.openfire.admin.group_002dedit_jsp._jspService(group_002dedit_jsp.java:176)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1359)
	at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.jivesoftware.util.LocaleFilter.doFilter(LocaleFilter.java:74)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.jivesoftware.util.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:50)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.jivesoftware.admin.PluginFilter.doFilter(PluginFilter.java:78)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.jivesoftware.admin.AuthCheckFilter.doFilter(AuthCheckFilter.java:164)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
	at org.eclipse.jetty.server.Server.handle(Server.java:349)
	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)
	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:919)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)
	at java.lang.Thread.run(Unknown Source)
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