Nzbdrone on freebsd won't run?

Hi after following instructions for installing it on my freebsd nas i got this error back.
Is there anyone to help me with this please?
error:Cannot open assembly ‘NzbDrone.exe’: No such file or directory.
What is the solution for this?
I want nzbdrone to replace sickbeard on my nas

Are you in the directory that contains NzbDrone.exe? If not you will have to use the full path to NzbDrone.exe

Yes i am and i can see the NzbDrone.exe file in it as well.
So teh path to start will be then mono --debug path to nzbdrone NzbDrone.exe?

When i do it with complete path i get this back:Cannot open assembly ‘/startpool/zfsguru/services/10.1-001/nzbdrone/NzbDrone’: F
ile does not contain a valid CIL image.

What version of mono?
What platform is it running on (x86, x64 or arm)?

I’ve had a report of this before, but I don’t recall what the resolution was, but it could be a platform issue or a missing component of mono.