Novice trying to estimate a DSGE

I hope someone could help me. I am trying to solve my first DSGE, so I am “new” with this kind of stuff…
I wrote my code and always get the same error message


(minus) the hessian matrix at the “mode” is not positive definite!
=> posterior variance of the estimated parameters are not positive.
You should try to change the initial values of the parameters using
the estimated_params_init block, or use another optimization routine.
Warning: The results below are most likely wrong!

In dynare_estimation_1 at 683
In dynare_estimation at 62
In argentina at 235
In dynare at 132

And, then after the presentation of the results from posterior maximization.

??? Error using ==> chol
Matrix must be positive definite.

Error in ==> metropolis_hastings_initialization at 52
d = chol(vv);

Error in ==> random_walk_metropolis_hastings at 58
ix2, ilogpo2, ModelName, MhDirectoryName, fblck, fline, npar, nblck, nruns, NewFile, MAX_nruns, d ] = …

Error in ==> dynare_estimation_1 at 1106

Error in ==> dynare_estimation at 62

Error in ==> argentina at 235

Error in ==> dynare at 132
evalin(‘base’,fname) ;

I guess this is all linked to the value of the parameters but I don’t know how to use the “estimated_params_init blocks” to get values that will work. I guess this is a very “novice” question, but I hope someone could help me out.
Thanks a lot !

argentina.mod (2.94 KB)
data_hp_arg_us.m (1.31 KB)