DTGuiHelper error.

It sounds like you messed up the installation with your .asmdef files. I suggest you delete them. There is a dependency on the RelationsInspector code that you've missed.

I previously tried making .asmdef files for Master Audio and our other plugins to see if it indeed saved on compile time, and was surprised to find that compile time actually *increased* if you had 2 of our plugins in the project, even if you only made code changes to one. So I abandoned that feature since decreasing compile time was the benefit of it, and it was false.