I get this error when I click on a guild member in the Professions tab after selecting a particular profession on the left (i.e.: Leatherworking):

Guildbook\Templates.lua:631: attempt to call global 'loadGuildMemberTradeskills' (a nil value)
[string "@Guildbook\Templates.lua"]:631: in function <Guildbook\Templates.lua:630>