bench: TemplateNotFound "default"

[yi427]

I discovered the issue for the TemplateNotFound in use bench 'ls /usr/bin | wc -l' --output a.html command.
That don't generate the a.html file for above command.

My system is the wsl2 for the ubuntu, and install the tool use the brew install bench.

Follow is the picture for the detailed of the error, I don't find about the information in the help option and the man bench.