Maybe you .NET experts could give me a shove in the correct direction.
I am still trying to resolve this error: "Error: Sys.InvalidOperationException: ‘DocMapUpdatePanelId’ is not a property or an existing field."
My ReportViewer won’t function and I’ve narrowed it down to system.web.extensions. I am using Framework 4.6.1 and should be using system.web.extensions 4.0.0.0. The references show it as 4.0.0.0 and when I try to add the reference I get a message that says “system.web.extensions is already referenced” I cannot remove the reference either.
When I look in the GAC, I do not see 4.0.0.0 but instead system.web.extensions 3.5.0.0.
I am working with Visual Studio 2017. I have installed all updates. No amount of uninstalling and reinstallng via NuGet makes a difference. Adding and removing dlls from the bin directory makes no difference. Solution has been cleaned. Temporary files have been cleared repeatedly.
Going to the forums with this results in a bunch of guessing, or silence.
Pretty sure I’m in Hell.
