internal server error

[Beto]

I've installed Sitebuilder a few weeks ago and everything was working fine. created a few sites and when I try to update now i get an internal server error.

This is from the errorlog:

Event Type: Warning
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1309
Date: 27/10/2006
Time: 8:47:21
User: N/A
Computer: VERTIGO
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 27/10/2006 8:47:21
Event time (UTC): 27/10/2006 6:47:21
Event ID: 854ad95be37f4dbab5d4b52494c259d2
Event sequence: 2
Event occurrence: 1
Event detail code: 0

Application information:
Application domain: /LM/W3SVC/2/Root-1-128064051999375000
Trust level: Full
Application Virtual Path: /
Application Path: C:\Program Files\SiteBuilder\Web\
Machine name: VERTIGO

Process information:
Process ID: 5740
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: RemotingException
Exception message: Requested Service not found

Request information:
Request URL: http://xxxxx.xxxx.xxx:2006/Login.aspx?ReturnUrl=/admin/Default.aspx
Request path: /Login.aspx
User host address: xxx.xxx.xxx.xxx
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 1
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at SWsoft.SiteBuilder.Hosting.IWorkEnvironment.get_IsRunUnderVz()
at SWsoft.SiteBuilder.BO.Facade.WorkEnvironment.get_IsRunUnderVZ()
at SWsoft.SiteBuilder.Web.UI.LoginPage.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at SWsoft.SiteBuilder.Web.UI.BasePage.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


Custom event details:

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


Does anyone know what I could do to solve this??