Resonse sendRedirect Method Problem in JSP

Kello experts. I am having a proble with response.sendRedirect method in one of my pages in JSP
Here is the error message:
Jun 8, 2007 10:09:46 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.servlet.ServletException: Exception in JSP: /macsweb/userGetMacsUser.jsp:17

14:                 strMessage = "No such user exists in the MACS system";
15:             }else{
16:                 String strURL = "userViewMacsUser.jsp?userID="+ macsUser.getUserID();
17:                 response.sendRedirect("http://www.msn.com");
18:                 return;
19:             }
20:         }


Stacktrace:
        at com.cbc.macs.web.Filter.MACWebAuthenticateFilter.doFilter(MACWebAuthenticateFilter.java:106)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:619)
Jun 8, 2007 10:09:46 AM org.apache.catalina.core.StandardHostValve custom
SEVERE: Exception Processing ErrorPage[exceptionType=javax.servlet.ServletException, location=/MACSWebErrorPage.jsp]
java.lang.IllegalStateException
        at org.apache.coyote.Response.reset(Response.java:296)
        at org.apache.catalina.connector.Response.reset(Response.java:645)
        at org.apache.catalina.connector.Response.reset(Response.java:909)
        at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:356)
        at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:212)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:134)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:619)


Here is the code that should execute
<%
    String strUID = "";
    String strMessage = "";
    String strMethod = request.getMethod();
    if(strMethod.equalsIgnoreCase("POST")){
        strUID = macsUser.getUserID();
        if(!strUID.equalsIgnoreCase("")){
            String strUser = macsUser.GetUser();
            if(strUser.equalsIgnoreCase("")){
                strMessage = "No such user exists in the MACS system";
            }else{
                String strURL = "userViewMacsUser.jsp?userID="+ macsUser.getUserID();
                response.sendRedirect("http://www.msn.com");
                return;
            }
        }
    }
%>
I just started to have this problem but this piece of code has worked before. I am at a loss and have no idea where else to look

Thanks
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