I am doing DSGE model in Dynare for my dissertation, and I am stuck with some problems that I am trying to figure why for few days. But I still can't fix it.

Two of my main questions are:

1.I got this:

'POSTERIOR KERNEL OPTIMIZATION PROBLEM!

(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 optimisation routine.'

2. In the RESULTS FROM POSTERIOR ESTIMATION section, the standard errors I got are 'NaN'

And I don't understand why there are no standard errors.

RESULTS FROM POSTERIOR ESTIMATION

parameters

prior mean mode s.d. prior pstdev

rho_p 0.500 0.5999 NaN beta 0.2000

rho_m 0.500 0.5999 NaN beta 0.2000

rho_x 0.500 0.7781 NaN beta 0.2000

I attached the mod file and my data.

Thank you so much.