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