error: java.lang.NoSuchMethodException

[FransZappa]

Update since my previous post:

Minimserver seems to be running according to minimwatch.
Qnap stopped giving the warnings on restart but there is no minimserver icon on the homepage so... That is not good.
Neither Lumin nor Kazoo CP's can see minimserver and state offline or not available.

What to do next, so still in need of your help please Colin