System.InvalidOperationException: Stack empty

Question

Once running ASP.NET 4.x application built in Visual Studio 2013 I am getting the below exception.

I have tried to disable the PageInspector by removing page inspect

Answer 1

In my case, because I had so many issues migrating a website from VS2002 to VS2015, I decided to create a new project on VS2015 and transfer all webforms from the old project (VS2002) to the new one (VS2015).

The new project had a Site.Master page, which already has a tag. Because I was transferring old webforms without modification, they already had a tag too, so each page trying to load had two tags inside.

When I removed the tag on each page, leaving only the one on Site.Master page, the problem was solved.

I hope this helps.