SSRS 2005 Web Farm Error : The Delivery Extension For This Subscription Could Not Be Loaded.

We are using RS2005 for a year now and never had any problems especially with mail subscriptions.

Since we transferred from single RS machine to web farm everything works ok except mail subscriptions. Subscription sometimes (?!?!?!?!) refuse to export report to a document of any kind. I repeat that this is a random thing which is more often with PDF and less with Web Archive or Excel. We are using shared schedules and on demand execution of AddEvent stored procedure by night batches to send mail to users. Also, original error from RS log says something that this kind of operation is not supported for server working in native mode. We don't have SharePoint so we never used it in any other way then native mode and it worked.



Any idea will be appreciated!

Thanks in advance.



Update 26.06.2007

It seems that problem is not loading dll used to export report to a file but loading email subscription extension (dll that needs to be loaded for execution of email subscription.)





Original error from RS Log:

w3wp!library!1!06/22/2007-11:06:43:: 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!1!06/22/2007-11:06:43:: 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)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache)
at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at Microsoft.ReportingServices.Diagnostics.ExtensionClassFactory.CreateExtensionObject(Extension extConfig).