Portal server question, pls help!

Hello,
I have Portal server 5.04 installed in my local PC. It works well until I modified LoginActions.xml file. After I changed LoginActions.xml, I could not login to portal any more and got "The server has experienced an error. Try again, or contact your portal administrator if you continue experiencing problems" error. Then I changed LoginActions.xml file back to original one. However, I still could not login and got the same error.
I am wondering if there is cache in the server and how can I restart Portal server and kill the cache? I rebooted IIS server, but it didn't help.
Thanks in advance!

I got three lines of error code from PTSpy:
Error 1:
Location: com.plumtree.uiinfrastructure.activityspace.Redirect.GetSpaceName() Message: Attempting to read from redirect before the space has been set.
Error 2
Loction: com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleRequest() Message: Unable to proccess request._System.NullReferenceException_ at com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleRedirects(Redirect myRedirect, RequestData tempData) _ at com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleRequest(IXPRequest request, IXPResponse response, ISessionManager session, IApplication application)
Error 3:
Location: com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleError()
Message: Server error._System.NullReferenceException_ at com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleRedirects(Redirect myRedirect, RequestData tempData) _ at com.plumtree.uiinfrastructure.activityspace.Interpreter.HandleRequest(IXPRequest request, IXPResponse response, ISessionManager session, IApplication application)
I am using UI Source Code.
Thanks again!

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hi experts,
I am relatively new to the pplsoft and trying to understand the concepts.
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