Hi chicoutimy,
Since release 4.6.0, the function declaration has been changed to reflect the move of some structures like M_
from global variables into function inputs
Dynare 4.6.0:
function [ys,params,check] = NK_baseline_steadystate(ys,exo,M_,options_)
Previous releases:
function [ys,check] = NK_baseline_steadystate(ys,exo)
See