I created some reports in Visual Studio 2015 with all the latest updates. However, when I try to deploy the reports I get this message:
The definition
The most simple and straight forward solution. I would suggest you to find Microsoft.ReportingServices.ReportViewerControl.WebForms in Manage NuGet Packages of the current project and update this dll version to latest version.
Navigate from VS menu: Tools > NuGet Package Manager > Manage NuGet Packages for Solution