ReportingWebService.svc could not be activated.

I have configured SQL 2012 SSRS SP1 on my sharepoint 2013 farm.

In my central admin when I click on manage service applications -> SSRS -> System settings. 

I get an error

The requested service, 'http:// sp2013vm15 :32843/9afcb121abc341479186720db5257886/ReportingWebService.svc' could not be activated. See the server's diagnostic trace logs for more information.

I have already seen this link

http: // prologika.com/CS/blogs/blog/archive/2012/03/15/can-t-activate-reporting-services-service-in-sharepoint.aspx

but this does not help because for my the SSRS web application pool already has 32 bit application as off.

I can see this in the ULS event log

The requested service, 'http: // sp2013vm15:32843/9afcb121abc341479186720db5257886/ReportServiceBackgroundProcessing.svc' could not be activated. See the server's diagnostic trace logs for more information.    Server stack trace:      at System.ServiceModel.Channels.HttpChannelUtilities.ValidateRequestReplyResponse(HttpWebRequest request, HttpWebResponse response, HttpChannelFactory`1 factory, WebException responseException, ChannelBinding channelBinding)     at System.ServiceModel.Channels.HttpChannelFactory`1.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)     at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)     at System.ServiceModel.Channels.Secu...1f3d349c-d4ee-e0f4-5fcb-8ad128800d29
...rityChannelFactory`1.SecurityRequestChannel.Request(Message message, TimeSpan timeout)     at System.ServiceModel.Dispatcher.RequestChannelBinder.Send(Message message, TimeSpan timeout)     at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)     at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)     at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)    Exception rethrown at [0]:      at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)     at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)  ...1f3d349c-d4ee-e0f4-5fcb-8ad128800d29
...   at Microsoft.ReportingServices.ServiceContract.IReportServiceBackgroundProcessing.RecycleAppDomain()     at Microsoft.ReportingServices.SharePoint.SharedService.Client.ReportingWebServiceApplicationProxy.ExecuteRecycleAppDomain(Uri endpointAddress)1f3d349c-d4ee-e0f4-5fcb-8ad128800d29
(ExecuteWcfOperation:http://schemas.microsoft.com/sqlserver/reporting/2011/06/01/ReportServer/BackgroundProcessing/RecycleAppDomain). Execution Time=29458.76941f3d349c-d4ee-e0f4-5fcb-8ad128800d29