Error when clicking "Manage Shared Schedules" under "Reporting Services" for SharePoint 2013 reporting service

After we enable the powerview features, we are getting the following ereror when clicking Site Settings-> Reporting Services-> Manage Shared Schedules.

 

"sharepoint 2013  Sorry, something went wrong An error occurred within the report server database.  This may be due to a connection failure, timeout or low disk condition within the database. ---> Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerStorageException: An error occurred within the report server database.  This may be due to a connection failure, timeout or low disk condition within the database. ---> System.Exception: For more information about this error navigate to the report server on the local server machine, or enable remote errors"

 

ULS log shows the following error.

Line 49277: 07/30/2014 13:43:26.73          w3wp.exe (0x1DBC)                                       0x0020  SQL Server Reporting Services               Report Server Catalog                    00000    Unexpected       Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerStorageException: , An error occurred within the report server database.  This may be due to a connection failure, timeout or low disk condition within the database.;                03b3a99c-e8bf-00e4-e462-3ffef5cc17cc

                Line 49278: 07/30/2014 13:43:26.73          w3wp.exe (0x1DBC)                                       0x0020  SQL Server Reporting Services               Report Server Catalog                    00000    Unexpected                Microsoft.ReportingServices.Diagnostics.Utilities.ReportServerStorageException: An error occurred within the report server database.  This may be due to a connection failure, timeout or low disk condition within the database. ---> System.Data.SqlClient.SqlException: The EXECUTE permission was denied on the object 'xp_sqlagent_notify', database 'mssqlsystemresource', schema 'sys'.     at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)     at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)     at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultS...  03b3a99c-e8bf-00e4-e462-3ffef5cc17cc

                Line 49279: 07/30/2014 13:43:26.73*        w3wp.exe (0x1DBC)                                       0x0020  SQL Server Reporting Services               Report Server Catalog                    00000    Unexpected       ...et bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)     at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)     at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds)     at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite)     at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, ...             03b3a99c-e8bf-00e4-e462-3ffef5cc17cc

                Line 49280: 07/30/2014 13:43:26.73*        w3wp.exe (0x1DBC)                                       0x0020  SQL Server Reporting Services               Report Server Catalog                    00000    Unexpected       ...Boolean asyncWrite)     at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()     at Microsoft.ReportingServices.Library.InstrumentedSqlCommand.ExecuteNonQuery()     --- End of inner exception stack trace ---     at Microsoft.ReportingServices.Library.Storage.WrapAndThrowKnownExceptionTypes(Exception e)     at Microsoft.ReportingServices.Library.InstrumentedSqlCommand.ExecuteNonQuery()     at Microsoft.ReportingServices.Library.SqlAgentScheduler.get_IsSchedulerRunning()     at Microsoft.ReportingServices.Library.SchedulingDBInterface.ListTasks(CatalogItemPath path)     at Microsoft.ReportingServices.Library.ListSchedulesAction.PerformActionNow()     at Microsoft.ReportingServices.Library.RSSoapAction`1.Execute() 03b3a99c-e8bf-00e4-e462-3ffef5cc17cc

After review the same issue reported by Majid Baig, it seems this is caused by permission configuration. However, I’m not sure the process provided will comply with Microsoft suggestions. Anyone knows Microsoft suggested procedure?