LMS 7.8.1 on QNAP TS219 - error

Hi,

I've been running 7.3.3 on a QNAP TS219 for several years. Today I decided was the day to upgrade to a newer version.

I downloaded 7.4.4 first, and ran the upgrade through SSODS. The software installed correctly, but when trying to start the service I got an error.

I then downloaded and tried 7.8.1, and got the same.

I've tried going back to 7.3.3 but that won't run now either.

The error I get is:

0003: The following modules failed to load: YAML::XS
0002: [14-11-15 08:48:43 ] ssctrl Command line = /volume1/SqueezeCenter/slimserver.pl --daemon --pidfile /volume1/SqueezeCenter/Cache/squeezecenter.pid --cachedir /volume1/SqueezeCenter/Cache --logdir /volume1/SqueezeCenter/Logs --prefsdir /volume1/SqueezeCenter/prefs --noupnp --user ssods --group everyone --httpport 9001
0001: [14-11-15 08:48:21 ] ssctrl Starting SqueezeCenter 7.8.1-1415964505.

This means nothing to me, so I'd really appreciate any pointers as to what to do next. The NAS is running the latest firmware, FWIW.

Thanks,
Dan