Yes I checked PATH and /usr/local/bin in there, and the file name is correct and spelled proper case, just never executes. It will execute if manually ran from a terminal, but from within OctoPrint UI, I always get this error.
I do have that Safety User Authentication enabled on the PI so people cant log in and mess, perhaps the user logged in doesnt have permissions?
I tried to log into the UI as "pi", but its an invalid login. Must only be good for ssh.