Hi @Govindan, Balaji
What is your specific error message? Have you updated existing projects to the latest version? You can check this document: https://learn.microsoft.com/en-us/sql/reporting-services/application-integration/integrating-reporting-services-using-reportviewer-controls-get-started?view=sql-server-ver15#update-an-existing-project-to-use-the-report-viewer-control.
Best regards,
Aniya