Error config Portal Services: Location of 'applications.xml'

[meo.tom.9]

Hi guy
I'm a newbie. I have a quest same like the title.
My server about:
- Gate way: *.26:80
- 2 dispatcher: *.26:9081 and *.25:9080
All 2 server was installed SDK.
But i modify file applications.xml in *.26:  all application connect to http://*.26:9081/samples/cps4/*.jsp
And i config Location of 'applications.xml' in both server is: http://*.26:9081/samples/cps4/applications.xml
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I go to portal web and create new page and make new IBM Cognos Extended Applications Portlet
       
but no apps, then i click the 'Select an application' ... the error show:
SDK-ERR-0001
Cannot read the file 'applications.xml'. Make sure that the Cognos Extended Applications Portlet is installed and configured properly.
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What's wrong? Sb have me to fix it !!!