VerifyClient() throws exception that I don't understand...

i got following exception have no idea did wrong.


------------
client verification failure.
you must have valid login access page.


the error occuried in xxx.cfm line x
------------
(where x line have <cfset verifyclient()>


any idea mean? valid login? use own login mechanism. tried cfloginuser, won't work either. have set this.sessionmanagement = true in application.cfc, prereq. of calling verfiyclient()...

thanks

stack trace:

coldfusion.tagext.html.ajax.ajaxutils$clientverificationexception: client verification failure.
@ coldfusion.tagext.html.ajax.ajaxutils.verifyclient(ajaxutils.java:174)
@ coldfusion.runtime.cfpage.verifyclient(cfpage.java:6425)
@ cftmp2ecfm1926349466.runpage(c:\coldfusion8\wwwroot\formgen\tests\tmp.cfm:2)
@ coldfusion.runtime.cfjsppage.invoke(cfjsppage.java:192)
@ coldfusion.tagext.lang.includetag.dostarttag(includetag.java:366)
@ coldfusion.filter.cfincludefilter.invoke(cfincludefilter.java:65)
@ coldfusion.filter.applicationfilter.invoke(applicationfilter.java:273)
@ coldfusion.filter.requestmonitorfilter.invoke(requestmonitorfilter.java:48)
@ coldfusion.filter.monitoringfilter.invoke(monitoringfilter.java:40)
@ coldfusion.filter.pathfilter.invoke(pathfilter.java:86)
@ coldfusion.filter.licensefilter.invoke(licensefilter.java:27)
@ coldfusion.filter.exceptionfilter.invoke(exceptionfilter.java:70)
@ coldfusion.filter.clientscopepersistencefilter.invoke(clientscopepersistencefilter.java:2 8)
@ coldfusion.filter.browserfilter.invoke(browserfilter.java:38)
@ coldfusion.filter.nocachefilter.invoke(nocachefilter.java:46)
@ coldfusion.filter.globalsfilter.invoke(globalsfilter.java:38)
@ coldfusion.filter.datasourcefilter.invoke(datasourcefilter.java:22)
@ coldfusion.cfmservlet.service(cfmservlet.java:175)
@ coldfusion.bootstrap.bootstrapservlet.service(bootstrapservlet.java:89)
@ jrun.servlet.filterchain.dofilter(filterchain.java:86)
@ coldfusion.monitor.event.monitoringservletfilter.dofilter(monitoringservletfilter.java:42 )
@ coldfusion.bootstrap.bootstrapfilter.dofilter(bootstrapfilter.java:46)
@ jrun.servlet.filterchain.dofilter(filterchain.java:94)
@ jrun.servlet.filterchain.service(filterchain.java:101)
@ jrun.servlet.servletinvoker.invoke(servletinvoker.java:106)
@ jrun.servlet.jruninvokerchain.invokenext(jruninvokerchain.java:42)
@ jrun.servlet.jrunrequestdispatcher.invoke(jrunrequestdispatcher.java:284)
@ jrun.servlet.servletengineservice.dispatch(servletengineservice.java:543)
@ jrun.servlet.http.webservice.invokerunnable(webservice.java:172)
@ jrunx.scheduler.threadpool$downstreammetrics.invokerunnable(threadpool.java:320)
@ jrunx.scheduler.threadpool$threadthrottle.invokerunnable(threadpool.java:428)
@ jrunx.scheduler.threadpool$upstreammetrics.invokerunnable(threadpool.java:266)
@ jrunx.scheduler.workerthread.run(workerthread.java:66)

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