Multivariate kalman filter become singular

Good day all, I am experiencing challenge with my model. I kept getting the below error messages:

There are 4 eigenvalue(s) larger than 1 in modulus
for 4 forward-looking variable(s)

The rank condition is verified.

initial_estimation_checks:: The forecast error variance in the multivariate Kalman filter became singular.
initial_estimation_checks:: This is often a sign of stochastic singularity, but can also sometimes happen by chance
initial_estimation_checks:: for a particular combination of parameters and data realizations.
initial_estimation_checks:: If you think the latter is the case, you should try with different initial values for the estimated parameters.

ESTIMATION_CHECKS: There was an error in computing the likelihood for initial parameter values.
ESTIMATION_CHECKS: If this is not a problem with the setting of options (check the error message below),
ESTIMATION_CHECKS: you should try using the calibrated version of the model as starting values. To do
ESTIMATION_CHECKS: this, add an empty estimated_params_init-block with use_calibration option immediately before the estimation
ESTIMATION_CHECKS: command (and after the estimated_params-block so that it does not get overwritten):

Error using initial_estimation_checks (line 159)
Error using initial_estimation_checks (line 159)
initial_estimation_checks:: The forecast error variance in the
multivariate Kalman filter became singular.

Error in dynare_estimation_1 (line 164)
oo_ =
initial_estimation_checks(objective_function,xparam1,dataset_,dataset_info,M_,estim_params_,options_,bayestopt_,bounds,oo_);

Error in dynare_estimation (line 105)
dynare_estimation_1(var_list,dname);

Error in ubahcode.driver (line 514)
oo_recursive_=dynare_estimation(var_list_);

Error in dynare (line 293)
evalin(‘base’,[fname ‘.driver’]) ;

ubahcode.mod (3.2 KB)
ifeanyicode.xls (31 KB)

Please see

Thank you Professor jpfeifer for your response.
Please what are the two ways out of this problem? Thank you.

Simply follow the link embedded in the title of the referenced post.

Okay, Thank Professor jpfeifer.

I really appreciate