when run attached file, i see following error:

??? Input argument “params” is undefined.

Error in ==> model_static at 15

rhs =y(15)*params(4)+params(1)+x(1);

Error in ==> solve1 at 55

fvec = feval(func,x,varargin{:});

Error in ==> dynare_solve at 73

[x,info]=solve1(func,x,j1(r(i):r(i+1)-1),j2(r(i):r(i+1)-1),jacobian_flag,varargin{:});

Error in ==> evaluate_steady_state at 66

[ys,check] = dynare_solve([M.fname ‘_static’],…

Error in ==> steady_ at 54

[steady_state,params,info] =

evaluate_steady_state(oo_.steady_state,M_,options_,oo_,~options_.steadystate.nocheck);

Error in ==> steady at 81

[steady_state,M_.params,info] = steady_(M_,options_,oo_);

Error in ==> model at 224

steady;

Error in ==> dynare at 120

evalin(‘base’,fname) ;

please help if you can. are this a bug ?