Trying to launch thumbor with a unix socket ends with "No such device or address"

Trying to launch thumbor with a unix socket ends with "No such device or address": a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). I'm trying to make thumbor listen to an Unix socket instead of port (and to automate this via systemd but that's another story).