If you start getting the following error when running
WARN 2021/04/10 17:51:51 found no layout file for "HTML" for kind "home": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
That’s because you probably lost the themes you had installed.
In my case I use Git Modules so to fix it I did the following:
git submodule init git submodule update
After that I got my themes back and everything was running fine again.
I hope you find it useful, Cheers.