This past weekend, I updated a large application I developed a few years ago to DNN 9.2.1 and got everything working (http://www.browserquests.com). Next, I downloaded everything and got the application working locally as well, so I can begin updating it with new code (via Visual Studio 2017).

However, I can't get the solution to build locally. Each time I try, I get two errors: "Could not load type 'DotNetNuke.UI.WebControls.SolPartActions'" on files /admin/actions.ascx and /admin/solpartactions.ascx. I tried removing the files but that just leads to a lot of additional errors. Does anyone have experience with this and could help me out?