[NTG-context] errors processing context manual

Hello, There are 3 errors when processing the context manual: 1.) ! LuaTeX error ...text/tex/texmf-context/tex/context/base/core-con.lua:178: attempt to call local 'mapper' (a table value) \starttext \startitemize[g] \item a \type{g} for Greek characters \item a \type{G} for Greek capitals \stopitemize \stoptext 2.) ! Undefined control sequence: \showcharacters \starttext \showcharacters \stoptext 3.) ! Undefined control sequence: \@@xysx ->\@@lysscale \starttext \showprint[][][scale=1.5] \stoptext What can be done? TIA for any help, -- Peter