I installed Visual Studio 2026 18.7.0 update and then could no longer run Hot-Reload.

The error message threw me off because it has always worked. After a couple of days I was annoyed so looked into the error more closely and sure enough, I had code inside <toolbar> tags on a page I had not touched in about 6-8 months. I guess this VS update makes thing a bit more restrictive for the better. Anyway, I changed the code to a javascript function and then I was able to run the Hot-Reload successfully after that.