I was just working with a Bootstrap layout page. I've done all the proper layout control registration, set up the website template correctly, etc. and was working with the page for a few hours and then quite randomly I began getting that beautiful yellow stack trace error.
I reviewed ToolBoxesConfig.config and indeed the control is registered.
I reviewed the layout widget controls folder in the theme folder and indeed the layout template .ascx files are there.
The error itself is pretty generic, as you can see in the attached screenshot.
Anyone have an idea what might be causing this issue that has brought my afternoon to a grinding halt?
Thanks in advance!