Assume that you use the Microsoft SQL Server 2016 Reporting Services (SSRS 2016) Report Viewer Web Part in Microsoft SharePoint 2013. After you upgrade from SharePoint 2013 to SharePoint 2016, you may notice that the SharePoint sites fail to load, because multiple SSRS web parts are not upgraded and refer the wrong version.
To work around this issue, you may remove the Report Viewer Web Part from the SharePoint site and then re-add the web parts.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 4024715 - Last Review: 2017, ഓഗ 8 - Revision: 5