You can type 'literals' into a template.
Normal usage is to include them as additional terms to be used along with fields.
Code:
"00noseries/{author_sort[0]}_authors/{authors}/{title}
00noseries/A
_authors/Hans Anderson
It appears your template was clipped from a post and you did not make the
user field substitutions (templates can only be used 'as is' if they only apply to standard calibre fields)