Internal error occured on the report server

Hi,

i am having some problems figuring out why i would be getting the following error on my SQL Reporting Server when trying to create a new subscription for any report:

"An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help For more information about this error navigate to the report server on the local server machine, or enable remote errors "

the environment is set up like this:

2 servers in total

Server A has only Microsoft SQL Server Reporting Services Version 9.00.4035.00 installed
Server B is a DB Engine server (SQL Server 2008 cluster) which hosts the reporting databases (among others).

everything works fine as far as im aware on the reporting server apart from the subscriptions.

in the SSRS log i can only see this error line:

w3wp!library!5!09/24/2010-10:51:04:: Call to GetPermissionsAction(/ConfigMgr/[ Tier 1 Reports ]/[ SCCM ] - List of all unknown servers).

w3wp!library!5!09/24/2010-10:51:04:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.OperationNotSupportedNativeModeException: The operation  is not supported on a report server that runs in native mode., ;
 Info: Microsoft.ReportingServices.Diagnostics.Utilities.OperationNotSupportedNativeModeException: The operation  is not supported on a report server that runs in native mode.

w3wp!extensionfactory!5!09/24/2010-10:51:04:: e ERROR: Exception caught instantiating Report Server DocumentLibrary report server extension: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeInitializationException: The type initializer for 'Microsoft.ReportingServices.SharePoint.SharePointDeliveryExtension.DocumentLibraryProvider' threw an exception. ---> Microsoft.ReportingServices.Diagnostics.Utilities.OperationNotSupportedNativeModeException: The operation  is not supported on a report server that runs in native mode.
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck)





In the Event Viewer there is the following error logged:

Source: Report Server
Category: Extension
Event ID: 108

Report Server (MSSQLSERVER) cannot load the Report Server DocumentLibrary extension.




Can anyone help out ?