SQL Server Reporting Services 2012 Configuration

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SQL-Server

reporting

OS: Windows Server 2008 R2 Standard 64bit
Running Sql Server 2012 database and report server on same VM machine.

When I stop the reporting service using the "Reporting Service Configuration Manager", the service stops but a error is logged in the event log:

Failed to unload app domain DefaultDomain. The following exception occurred: Error while unloading appdomain. (Exception from HRESULT: 0x80131015). 

Also in the SSRS LogFiles folder an entry shows:

rpcserver!DefaultDomain!9b8!09/21/2012-12:43:59:: i INFO: Process monitoring stopped. 
rpcserver!DefaultDomain!af8!09/21/2012-12:43:59:: i INFO: RPC Server stopped. servicecontroller!DefaultDomain!af8!09/21/2012-12:43:59:: i INFO: RPC Server stopped. 
appdomainmanager!DefaultDomain!af8!09/21/2012-12:43:59:: i INFO: Appdomain:3 ReportServer_MSSQLSERVER_0-1-129927191848544775 unregistered. appdomainmanager!ReportServer_0-1!af8!09/21/2012-12:43:59:: i INFO: Appdomain:3 ReportServer_MSSQLSERVER_0-1-129927191848544775 unloading dbpolling!WindowsService_0!9b8!09/21/2012-12:43:59:: i INFO: EventPolling polling service stopped 
dbpolling!WindowsService_0!9b8!09/21/2012-12:43:59:: i INFO: NotificationPolling polling service stopped 
dbpolling!WindowsService_0!9b8!09/21/2012-12:43:59:: i INFO: SchedulePolling polling service stopped 
dbpolling!WindowsService_0!9b8!09/21/2012-12:43:59:: i INFO: UpgradePolling polling service stopped servicecontroller!WindowsService_0!af8!09/21/2012-12:43:59:: i INFO: Service controller exiting. appdomainmanager!DefaultDomain!af8!09/21/2012-12:43:59:: i INFO: Appdomain:2 WindowsService_0 unregistered. 
appdomainmanager!DefaultDomain!af8!09/21/2012-12:43:59:: i INFO: Appdomain:2 WindowsService_0 unloading. 
appdomainmanager!DefaultDomain!9b8!09/21/2012-12:43:59:: i INFO: AppDomain:2 0 pending unload(s) 
appdomainmanager!DefaultDomain!dec!09/21/2012-12:43:59:: i INFO: Appdomain:2 unregistered. 
rshost!rshost!dec!09/21/2012-12:43:59:: i INFO: Application domain type WindowsService statistics: created: 1, unloaded: 1, failed: 0, timed out: 0. servicecontroller!DefaultDomain!af8!09/21/2012-12:44:00:: i INFO: Service shutting down. 
rshost!rshost!7dc!09/21/2012-12:44:00:: e ERROR: Generating a dump and exiting the process due to fatal runtime error. 

This error does not seem to adversely impact on anything. Any help you can provide will be much appreciated.