碰到了如下，错误，搜了下，说改变一下 mode_compute 的值。如果设置成0，需要指定mode_file，这个从哪弄来啊？难道是上一次计算的结果吗？  此外，对此类错误还有其他的办法吗
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Log data density [Laplace approximation] is 434.399555.

??? 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
            feval(options_.posterior_sampling_method,'DsgeLikelihood',options_.proposal_distribution,xparam1,invhess,bounds,gend,data,...
            
Error in ==> dynare_estimation at 62
    dynare_estimation_1(var_list,varargin{:});


Error in ==> quantity_price_q5 at 317
dynare_estimation(var_list_);


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