missing readable error message

[SupraSummus]

#!/usr/bin/env pgspawn
nodes:
  - command: [minos/minos, 0, 3, "-,1"]
    inputs:
      0: program
      3: program_inner
    outputs:
      #1: test
  - command: [cat, programs/cnew.c.bin]
    outputs: {1: program}
  - command: [cat, programs/hello.asm.bin]
    outputs: {1: program_inner}
  - command: [./stdin-eq, "parent\nhello world\n"]
    inputs:
      0: test

results in a stacktrace