Exception in the console when editing groups using the new UI

12:37:09,800 [P1-17] ERROR log.SimpleLog4JLogSystem        - Method sendRedirect threw exception for reference $response in template  at  [69,1] 
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'sendRedirect' in  class com.xpn.xwiki.web.XWikiServletResponse threw exception java.lang.IllegalStateException: Committed @ <unknown template>[69,11]
        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:286)
        at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
        at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:88)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:238)
        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:152)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1309)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1278)
        at com.xpn.xwiki.api.XWiki.parseTemplate(XWiki.java:605)
        at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
        at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:203)
        at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:294)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at org.apache.velocity.runtime.directive.VelocimacroProxy.render(VelocimacroProxy.java:194)
        at org.apache.velocity.runtime.parser.node.ASTDirective.render(ASTDirective.java:170)
        at org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:74)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfStatement.java:107)
        at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:318)
        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:238)
        at com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRenderer.java:152)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1309)
        at com.xpn.xwiki.XWiki.parseTemplate(XWiki.java:1278)
        at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:105)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:158)
        at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        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:596)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:428)
        at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:830)
        at com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:117)
        at org.mortbay.jetty.servlet.WebApplicationHandler$CachedChain.doFilter(WebApplicationHandler.java:821)
        at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:471)
        at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:568)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
        at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:633)
        at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
        at org.mortbay.http.HttpServer.service(HttpServer.java:954)
        at org.mortbay.http.HttpConnection.service(HttpConnection.java:816)
        at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:983)
        at org.mortbay.http.HttpConnection.handle(HttpConnection.java:833)
        at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
        at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
        at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
Caused by: java.lang.IllegalStateException: Committed
        at org.mortbay.jetty.servlet.ServletHttpResponse.resetBuffer(ServletHttpResponse.java:212)
        at org.mortbay.jetty.servlet.ServletHttpResponse.sendRedirect(ServletHttpResponse.java:458)
        at com.xpn.xwiki.web.XWikiServletResponse.sendRedirect(XWikiServletResponse.java:48)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:295)
        at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:245)
        ... 52 more