There was a problem retrieving the language file

This product has worked well until this morning. Its on a Windows2003.

Browsing to the site now I get the message: 
There was a problem retrieving the language file: Internal Server Error (Error 500)


The Event Viewer message is this

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 6/16/2009 11:23:51 AM 
Event time (UTC): 6/16/2009 1:23:51 AM 
Event ID: c5beeda39ab8496aa7d5a5948564582e 
Event sequence: 7 
Event occurrence: 2 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/1515208653/Root-1-128895889418906250 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: F:\FileVista\ 
    Machine name: FUSE 
 
Process information: 
    Process ID: 2352 
    Process name: w3wp.exe 
    Account name: NT AUTHORITY\LOCAL SERVICE 
 
Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object. 
 
Request information: 
    Request URL: http://files.em.com.au/filevistacontrol/filevista.asmx/GetLanguageFile 
    Request path: /filevistacontrol/filevista.asmx/GetLanguageFile 
    User host address: 192.168.1.48 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: NT AUTHORITY\LOCAL SERVICE 
 
Thread information: 
    Thread ID: 1 
    Thread account name: NT AUTHORITY\LOCAL SERVICE 
    Is impersonating: False 
    Stack trace:    at GleamTech.FileVista.AuthenticationManager.Authenticate(HttpContext context)
   at GleamTech.FileVista.FileVistaGlobalAsax.Application_AcquireRequestState(Object sender, EventArgs e)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 
 
Custom event details: 

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Please see this topic:
Problem Retrieving Language File

I have tried every suggestion here. I have also reinstalled Filevista from the latest version downloaded.

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 6/22/2009 9:15:00 AM 
Event time (UTC): 6/21/2009 11:15:00 PM 
Event ID: e6aaa1e42c1941d29362004d299e1988 
Event sequence: 10 
Event occurrence: 3 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/1515208653/Root-1-128900994845625000 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: F:\FileVista\ 
    Machine name: FUSE 
 
Process information: 
    Process ID: 1480 
    Process name: w3wp.exe 
    Account name: NT AUTHORITY\LOCAL SERVICE 
 
Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object. 
 
Request information: 
    Request URL: http://files.em.com.au/filevistacontrol/filevista.asmx/GetLanguageFile 
    Request path: /filevistacontrol/filevista.asmx/GetLanguageFile 
    User host address: 192.168.1.48 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: NT AUTHORITY\LOCAL SERVICE 
 
Thread information: 
    Thread ID: 6 
    Thread account name: NT AUTHORITY\LOCAL SERVICE 
    Is impersonating: False 
    Stack trace:    at GleamTech.FileVista.AuthenticationManager.Authenticate(HttpContext context)
   at GleamTech.FileVista.FileVistaGlobalAsax.Application_AcquireRequestState(Object sender, EventArgs e)
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
 
 
Custom event details: 

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

This error occurs when the ASP.NET Session module is disabled.

First make sure that this line is included in FileVista's web.config:

<sessionState mode="InProc"/>

Then make sure that the following line is included in your machine's global web.config (C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\CONFIG\web.config) under <httpModules> section:

<add name="Session" type="System.Web.SessionState.SessionStateModule"/>

Or you can try to include the above line in the FileVista's web.config instead.

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 6/24/2009 9:57:10 AM 
Event time (UTC): 6/24/2009 1:57:10 PM 
Event ID: a728b8f1ed0a4f2db4d5ea5a99d0c5b8 
Event sequence: 14 
Event occurrence: 1 
Event detail code: 0 
 
Application information: 
    Application domain: /LM/W3SVC/3/ROOT-8-128903254240826388 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: D:\pair5\Development\netCLARUS\netCLARUS.WebApp\ 
    Machine name: DEVPAIR5 
 
Process information: 
    Process ID: 5468 
    Process name: w3wp.exe 
    Account name: NT AUTHORITY\NETWORK SERVICE 
 
Exception information: 
    Exception type: NullReferenceException 
    Exception message: Object reference not set to an instance of an object. 
 
Request information: 
    Request URL: http://localhost/FileVistaControl/filevista.asmx/GetLanguageFile 
    Request path: /FileVistaControl/filevista.asmx/GetLanguageFile 
    User host address: ::1 
    User:  
    Is authenticated: False 
    Authentication Type:  
    Thread account name: NT AUTHORITY\NETWORK SERVICE 
 
Thread information: 
    Thread ID: 7 
    Thread account name: NT AUTHORITY\NETWORK SERVICE 
    Is impersonating: False 
    Stack trace:    at netCLARUS.Business.Objects.Security.DataSecurityEnforcer.Enforce(Session session, IHttpInfo httpInfo, IXpoBase xpoObject) in D:\pair5\Development\netCLARUS\netCLARUS.Business\Objects\Security\DataSecurityEnforcer.cs:line 12
   at netCLARUS.Business.Objects.XpoHelper.FindObjectByInterface[I](Session session, IHttpInfo httpInfo, CriteriaOperator criteria) in D:\pair5\Development\netCLARUS\netCLARUS.Business\Objects\XpoHelper.cs:line 28
   at netCLARUS.Business.Objects.Utils.PermissionsHelper.IsUserAllowedReportAccess(IHttpInfo info) in D:\pair5\Development\netCLARUS\netCLARUS.Business\Objects\Utils\PermissionsHelper.cs:line 22
   at netCLARUS.WebApp.HttpModules.PrivilegeAuthorizationModule.context_AuthorizeRequest(Object sender, EventArgs e) in D:\pair5\Development\netCLARUS\netCLARUS.WebApp\HttpModules\PrivilegeAuthorizationModule.cs:line 19
   at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

I went through the steps mentioned in forum regarding this issue. I gave Network Services the necessary permissions on both C:\windows\temp and C:\Windows\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files. I have verified that the sessionstate is 'InProc' and the <HttpModule> section has the session in webconfig in C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG

Still having problem with this issue.

Hi Sanjay,
Your issue is different. I see from your error log that you have a HttpModule (PrivilegeAuthorizationModule), it seems this module interferes and somehow effects the ASP.NET session module. Please investigate why this module effects the session.