ssrs22008r2 error : Number must be either non-negative and less than or equal to Int32

Hello,

We Unable to access or deploy reports in ssrs22008R2 , which was working fine for us earlier. We are getting below error :

An internal error occurred on the report server.

See the error log for more details. (rsInternalError) Get Online Help Number must be either non-negative and less than or equal to Int32.MaxValue or -1. Parameter name: timeout

Also attached extract from log file :

crypto!ReportServer_0-2!11c8!11/29/2012-20:42:15:: i INFO: Exporting public key
crypto!ReportServer_0-2!11c8!11/29/2012-20:42:15:: i INFO: Performing sku validation
crypto!ReportServer_0-2!11c8!11/29/2012-20:42:15:: i INFO: Importing existing encryption key
library!ReportServer_0-2!11c8!11/29/2012-20:42:15:: Call to ListParentsAction(/).
library!ReportServer_0-2!11c8!11/29/2012-20:42:15:: Call to ListChildrenAction(/, False).
webserver!ReportServer_0-2!11c8!11/29/2012-20:42:15:: i INFO: Processed folder '/'
library!ReportServer_0-2!10c4!11/29/2012-20:42:15:: Call to GetPermissionsAction(/).
library!ReportServer_0-2!1734!11/29/2012-20:42:16:: Call to GetPropertiesAction(/, PathBased).
library!ReportServer_0-2!10c4!11/29/2012-20:42:16:: Call to GetPropertiesAction(/, PathBased).
library!ReportServer_0-2!10c4!11/29/2012-20:42:16:: Call to GetSystemPermissionsAction().
library!ReportServer_0-2!1734!11/29/2012-20:42:16:: Call to ListChildrenAction(/, False).
library!ReportServer_0-2!10c4!11/29/2012-20:42:16:: Call to GetSystemPropertiesAction().
library!ReportServer_0-2!10c4!11/29/2012-20:42:16:: Call to GetSystemPropertiesAction().
library!ReportServer_0-2!1734!11/29/2012-20:42:16:: Call to GetSystemPropertiesAction().
library!ReportServer_0-2!1734!11/29/2012-20:42:16:: Call to GetSystemPropertiesAction().
library!ReportServer_0-2!1734!11/29/2012-20:42:18:: Call to ListParentsAction(/BI_Automated_Reports).
library!ReportServer_0-2!1734!11/29/2012-20:42:18:: Call to ListParentsAction(/BI_Automated_Reports).
library!ReportServer_0-2!1734!11/29/2012-20:42:18:: Call to ListChildrenAction(/BI_Automated_Reports, False).
webserver!ReportServer_0-2!1734!11/29/2012-20:42:18:: i INFO: Processed folder '/BI_Automated_Reports'
processing!ReportServer_0-2!1734!11/29/2012-20:42:21:: e ERROR: Throwing Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: , Microsoft.ReportingServices.ReportProcessing.ReportProcessingException: An unexpected error occurred in Report Processing. ---> System.ArgumentOutOfRangeException: Number must be either non-negative and less than or equal to Int32.MaxValue or -1.
Parameter name: timeout
   at System.Threading.Monitor.TryEnter(Object obj, TimeSpan timeout)
   at Microsoft.ReportingServices.Library.MultithreadedConnectionManager.AcquireLock()
   at Microsoft.ReportingServices.Library.MultithreadedConnectionManager.ConnectionLock..ctor(MultithreadedConnectionManager connectionManager)
   at Microsoft.ReportingServices.Library.MultithreadedConnectionManager.EnterThreadSafeContext()
   at Microsoft.ReportingServices.Library.ConnectionManager.BeginTransaction(IsolationLevel isoLevel)
   at Microsoft.ReportingServices.Library.ServerSnapshot.InitializeChunkConnection()
   at Microsoft.ReportingServices.Library.ServerSnapshot.GetChunk(String name, ReportChunkTypes type, Boolean supportReadWrite, WriteOptions updateMode, String& mimeType)
   at Microsoft.ReportingServices.Library.ServerSnapshot.GetChunk(String name, ReportChunkTypes type, String& mimeType)
   at Microsoft.ReportingServices.Library.ReportSnapshot.Microsoft.ReportingServices.ReportProcessing.IChunkFactory.GetChunk(String chunkName, ReportChunkTypes type, ChunkMode mode, String& mimeType)
   at Microsoft.ReportingServices.Library.ReadOnlyChunkFactory.GetChunk(String chunkName, ReportChunkTypes type, ChunkMode mode, String& mimeType)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.DeserializeKatmaiReport(IChunkFactory chunkFactory, String chunkName, Boolean keepReferences, GlobalIDOwnerCollection globalIDOwnerCollection, IDOwner parentIDOwner, ReportItem parentReportItem)
   at Microsoft.ReportingServices.ReportProcessing.ReportProcessing.GetAllDataSources(ICatalogItemContext reportContext, IChunkFactory getCompiledDefinitionFactory, OnDemandSubReportDataSourcesCallback subReportCallback, DataSourceInfoCollection dataSources, DataSetInfoCollection dataSetReferences, Boolean checkIfUsable, ServerDataSourceSettings serverDatasourceSettings, RuntimeDataSourceInfoCollection& allDataSources, RuntimeDataSetInfoCollection& allDataSetReferences)
   --- End of inner exception stack trace ---;