[NTG-context] can't run external lua library

I'm trying to reuse a old library to generate poisson numbers. In old context versions the library works fine, but in the current beta (ConTeXt ver: 2015.07.16 13:30 MKIV beta fmt: 2015.7.23 int: english/english) the execution fails. This code works perfectly in lua 5.3 but not in luatex. why? \startluacode require "meurandist" ARRAY_SIZE=3 arr=meurandist.new_int(ARRAY_SIZE) meurandist.rpoisson(arr,ARRAY_SIZE,4) for i=0,ARRAY_SIZE-1 do print(meurandist.int_getitem(arr,i)) end \stopluacode Thanks a lot Jorge