Item not found exception when running report from Report Builde

ibrary!ReportServer_0-1!215c!07/21/2016-17:20:38:: Call to GetSystemPropertiesAction().
library!ReportServer_0-1!215c!07/21/2016-17:20:41:: Call to ListChildrenAction(/, False).
library!ReportServer_0-1!1d98!07/21/2016-17:20:42:: Call to ListChildrenAction(/MyReportFolder, False).
library!ReportServer_0-1!1d98!07/21/2016-17:20:44:: Call to GetItemTypeAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!3568!07/21/2016-17:20:44:: Call to GetItemTypeAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!3568!07/21/2016-17:20:44:: Call to GetReportDefinitionAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!215c!07/21/2016-17:20:45:: Call to GetItemDataSourcesAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!1d98!07/21/2016-17:20:45:: Call to GetItemTypeAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!1d98!07/21/2016-17:20:45:: Call to GetReportItemReferencesAction(/MyReportFolder/MyRep2).
library!ReportServer_0-1!1d98!07/21/2016-17:20:45:: Call to GetPropertiesAction(/MyReportFolder/MyRep2, PathBased).
library!ReportServer_0-1!3568!07/21/2016-17:20:45:: Call to CreateReportEditSessionAction(Parent=/MyReportFolder, Report=MyRep2).
library!ReportServer_0-1!1d98!07/21/2016-17:20:48:: Call to GetItemTypeAction(/MyReportFolder/DATA SOURCES/MyDataSource).
library!ReportServer_0-1!1d98!07/21/2016-17:20:48:: Call to GetDataSourceContentsAction(/MyReportFolder/DATA SOURCES/MyDataSource).
library!ReportServer_0-1!3568!07/21/2016-17:20:48:: Call to GetItemTypeAction(|jun25faz1stm5sbobls5jcm3|@|/MyReportFolder/MyRep2|).
library!ReportServer_0-1!3568!07/21/2016-17:20:48:: Call to SetReportDefinition(|jun25faz1stm5sbobls5jcm3|@|/MyReportFolder/MyRep2|).
library!ReportServer_0-1!1d98!07/21/2016-17:20:49:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.ItemNotFoundException: , Microsoft.ReportingServices.Diagnostics.Utilities.ItemNotFoundException: The item '|jun25faz1stm5sbobls5jcm3|@|/MyReportFolder/MyRep2|' cannot be found.;

Report Builder UI show this errror "The item '|jun25faz1stm5sbobls5jcm3|@|/MyReportFolder/MyRep2|' cannot be found. (rsItemNotFound)