Tomcat Exception (BaseCallHandler marshallException)

I don't understand why I keep having this exception...
Any hint what's wrong?

2010/4/1 PM 07:03:20 org.directwebremoting.dwrp.BaseCallHandler marshallException
Warning : Exception while processing batch
java.lang.IllegalArgumentException: Failed to find parameter: scriptSessionId
      at org.directwebremoting.dwrp.Batch.extractParameter(
      at org.directwebremoting.dwrp.Batch.<init>(
      at org.directwebremoting.dwrp.CallBatch.<init>(
      at org.directwebremoting.dwrp.BaseCallHandler.handle(
      at org.directwebremoting.servlet.UrlProcessor.handle(
      at org.directwebremoting.servlet.DwrServlet.doPost(
      at javax.servlet.http.HttpServlet.service(
      at javax.servlet.http.HttpServlet.service(
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(
      at org.apache.catalina.core.StandardWrapperValve.invoke(
      at org.apache.catalina.core.StandardContextValve.invoke(
      at org.apache.catalina.core.StandardHostValve.invoke(
      at org.apache.catalina.valves.ErrorReportValve.invoke(
      at org.apache.catalina.core.StandardEngineValve.invoke(
      at org.apache.catalina.connector.CoyoteAdapter.service(
      at org.apache.coyote.http11.Http11AprProcessor.process(
      at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(
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LinuxGuruLinux Server AdministratorCommented:

Do you have any scripts running? Also please try restarting the tomcat. The scriptSesssionId is passed to and required by the server. When its not passed it will result in an error from the server.

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xenia27Author Commented:
I have some javascript to renew user's that the reason why I have this exception?
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