Hi,
 acme, or libdraw is not finding your font.  What you can do is
$ 9p ls font

That shows  a listing of all available fonts pick one and use the -f / -F
flags with a font that is listed and see what happens.

This is the line that starts acme  in my riostart
acme -a -f /mnt/font/'Go Regular'/11a/font -F /mnt/font/'Go Mono'/11a/font&

good luck

don