Log datadensity[LaplaceApproximation]isNaN.Error using chol

Dear All,
I have run an open one country dsge model and it run for a while then end up as the following:
Log data density [Laplace approximation] is NaN.

Error using chol
Matrix must be positive definite.

Error in metropolis_hastings_initialization (line 68)
d = chol(vv);

Error in random_walk_metropolis_hastings (line 62)
ix2, ilogpo2, ModelName, MetropolisFolder, fblck, fline, npar, nblck, nruns, NewFile, MAX_nruns, d ] = …

Error in dynare_estimation_1 (line 782)

Error in dynare_estimation (line 89)

Error in Thesis130 (line 942)

Error in dynare (line 180)
evalin(‘base’,fname) ;

I have attached my mod file and my data, is anyone who could kindly have a look?
i am currently in the final year of my phd, however, in my universities, I do not get much help in Dynare programming, hence, I wish some kind people could give some guidance, and I will be grateful.
Sincerely, Jesse
australia_us_data30.zip (5.92 KB)
Thesis130.mod (32 KB)

Sorry, but I cannot run the files, because of

at the initial values.

Dear Johannes,
Thank you very much for your kind help, i will correct my model according to your helpful suggestions.