problem with a simple RBC model with news shock

[zhuang]

when i estimate a simple RBC model with news shocks, i meet problem as follow.
is there somebody who can fix this problem?
i attached my .mod file. any suggestion will appreciate.


??? Error using ==> schur
NaN or Inf prevents convergence.

Error in ==> lyapunov_symm at 46
[u,t] = schur(a);

Error in ==> DsgeLikelihood at 174
Pstar = lyapunov_symm(T,R*Q*R',options_.qz_criterium);

Error in ==> initial_estimation_checks at 58
[fval,cost_flag,ys,trend_coeff,info] = DsgeLikelihood(xparam1,gend,data);

Error in ==> dynare_estimation_1 at 320
initial_estimation_checks(xparam1,gend,data);

Error in ==> dynare_estimation at 62
dynare_estimation_1(var_list,varargin{:});

Error in ==> simplenews_est4 at 188
dynare_estimation(var_list_);

Error in ==> dynare at 102
evalin('base',fname) ;