Unable to generate two Exchange 2010 reports

i

I am using SCOM 2007 R2 and I am not able to pull the below Exchange 2010 reports in SCOM. till Last month its working fine and now the issue started.

1. Report Name: Microsoft.Exchange.2010.Reports.Transport.Platform.TopUsers
Error Message

Date: 2014-09-12 22:02:22
Application: System Center Operations Manager 2007 R2
Application Version: 6.1.7221.81
Severity: Error
Message: Cannot initialize report.

Microsoft.Reporting.WinForms.ReportServerException: An internal error occurred on the report server. See the error log for more details. (rsInternalError) ---> Microsoft.Reporting.WinForms.ReportServerException: For more information about this error navigate to the report server on the local server machine, or enable remote errors
   --- End of inner exception stack trace ---
   at Microsoft.Reporting.WinForms.ServerReport.GetExecutionInfo()
   at Microsoft.Reporting.WinForms.ServerReport.GetParameters()
   at Microsoft.EnterpriseManagement.Mom.Internal.UI.Reporting.Parameters.ReportParameterBlock.Initialize(ServerReport serverReport)
   at Microsoft.EnterpriseManagement.Mom.Internal.UI.Console.ReportForm.SetReportJob(Object sender, ConsoleJobEventArgs args)
Microsoft.Reporting.WinForms.ReportServerException: For more information about this error navigate to the report server on the local server machine, or enable remote errors

2.Microsoft.Exchange.2010.Reports.SLA
Error Message:
An error has occured during report processing.
Query execution failed for dataset 'OutageBreakdown'
For more information about this error navigate to the report server on the local server machine, or enable remote errors.

Please help us to resolve this issue.

Donald D'souza (http://donald-scom.blogspot.com/)