for example, this morning i got an exit status of 256 for a lauchagent, reaging system;log gave me :

Oct 27 05:45:00 imyt com.apple.launchd.peruser.501[124] (org.ytho.webkit.latest[4319]): posix_spawn("/Users/yt/bin/org.ytho.webkit.latest.zsh", ...): No such file or directory

launchd was unable to find the script "/Users/yt/bin/org.ytho.webkit.latest.zsh" because it doesn't exist altought the "/Users/yt/bin/org.ytho.webkit.latest.rb" (same name different extension) does exist…