monkeydo - Unable to parser the app's UUID from the PRG

Previously I've been able to run prg files manually in the sim. I go to the sdk folder, run simulator.exe, then run a command like monkeydo.bat c:\temp\12345.prg venu2 and it loads in the E4TI2841.PRGE3VE5015.PRGsim.

With prg files built for a FR255 it doesn't work and I get a message saying "Unable to parser the app's UUID from the PRG"

I've also noticed that on the FR255 the prg files are stored in Garmin\Apps\Media instead of just Apps.

The command was monkeydo.bat c:\temp\E4TI2841.PRG fr255

It works for E3VE5015.PRG venu2

I've tried sdk 6.4.2 and 7.1.1

Any ideas?