Where do you get ServUO Pub 55? atm from The ServUO Repo link is Pub 54 which is what i am running atm ..from the looks on The Repo Link Pub 55 is only 80% completeRavenwolfe is correct, you need to update your ServUO core and compile a new exe.
The initial VNc repository commit was:
"Vita-Nex: Core 3.0 for RunUO 2.7 and ServUO 55"
I had anticipated that the current ServUO repository would have hit that publish milestone, but it basically means you need the latest 54 minimum.