I have installed Umbraco on a Windows Web Server 2008 R2 and it works but not /base.

I have copied the same files to my local machine and everything is working fine including base.

I have no idea whats stopping this code from running on my webserver?

Does hanyone have any ideas i can try?

I get an eventlog trace :

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 2011-01-25 15:49:59
Event time (UTC): 2011-01-25 14:49:59
Event ID: d5db0f8dcc294bdbbdb340d910dd5235
Event sequence: 3
Event occurrence: 1
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/63/ROOT-1-129404405972922783
Trust level: Full
Application Virtual Path: /
Application Path: C:\inetpub\wwwroot\umbraco.ateatmp.plakat.se\
Machine name: WEBDEV

Process information:
Process ID: 8696
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE
Exception information:
Exception type: ReflectionTypeLoadException
Exception message: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.Assembly.GetTypes()
at umbraco.BusinessLogic.Utils.TypeFinder.FindClassesMarkedWithAttribute(Type attribute)
at umbraco.presentation.umbracobase.restExtension..ctor(String extensionAlias, String methodName)
at umbraco.presentation.umbracobase.requestModule.httpApp_PostAcquireRequestState(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Request information:
Request URL: http://umbraco.ateatmp.plakat.se/default.aspx
Request path: /default.aspx
User host address: 192.168.170.63
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE
Thread information:
Thread ID: 6
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.Assembly.GetTypes()
at umbraco.BusinessLogic.Utils.TypeFinder.FindClassesMarkedWithAttribute(Type attribute)
at umbraco.presentation.umbracobase.restExtension..ctor(String extensionAlias, String methodName)
at umbraco.presentation.umbracobase.requestModule.httpApp_PostAcquireRequestState(Object sender, EventArgs e)
at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)