asp.net - error when trying to populate the datasource : DevExpress Viewer

Question

iam using DexExpress Report and viewer, right now im using Custome ReportStorage to save the report into my database folowing this https://docs.devexpress.com/XtraReports/17553/web-reporting/asp-net-webforms-reporting/end-user-report-designer/add-a-report-storage ; but whene im trying to load the report Via Report Viewer i got this probleme : error when trying to populate the datasource il ysing the same code as https://docs.devexpress.com/XtraReports/17553/web-reporting/asp-net-webforms-reporting/end-user-report-designer/add-a-report-storage (CustomReportStorageWebExtension )

Answer 1

等待大神答复