Tvheadend

Hi there,

I have an otherwise fully working setup but cannot upgrade from 4.2.6 to a newer version. I was happily upgrading up to that point but all versions since bring up an error.
'undefined fdatasync' when doing
'tvheadend start' from the command line.

I'm running this in a Freenas 11.2 jail but was running fine in older 11.1 Freenas etc too.

Any ideas on how to resolve this or go about finding out what is causing the issue would be gratefully appreciated, thank you.