Andolfatto RBC Model

Hi, I would like some help to replicate the Andolfatto’s model presents in the article “Business Cycles and Labor-Market Search” (1996).
I have this error when trying to estimate the model.

"Error using stochastic_solvers (line 160)
2nd and 3rd order approximation not implemented for purely backward models

Error in resol (line 118)
[dr,info] = stochastic_solvers(dr,check_flag,M,options,oo);

Error in stoch_simul (line 76)
[oo_.dr,info,M_,options_,oo_] = resol(0,M_,options_,oo_);

Error in ando (line 181)
info = stoch_simul(var_list_);

Error in dynare (line 120)
evalin(‘base’,fname) ;"

Thanks for your help

Why do you have an almost static model? Except for z, you have no variables dated (+1) or (-1), which cannot be correct.