In my case in both instances the programs were FIDOPOLL and MUTIL that were run as MIS event tasks. Once I included the full path to the executable then the process result changed to zero.
Yep error 127 is returned by "bash" and it means "command not found"...
usually that just means you need to put a path in there, or you have a typo, etc.
--- Mystic BBS v1.12 A36 (Windows/32)
* Origin: Sector 7 [Mystic BBS WHQ] (21:1/108)