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I have some difficulties in find flaws in the following,Could someone help me?

Prior distribution for parameter 16 has two modes!
Warning: File 'DSGE/prior' not found.
> In CheckPath at 42
In set_prior at 227
In dynare_estimation_1 at 83
In dynare_estimation at 62
In DSGE at 358
In dynare at 132
??? Attempted to access k(1); index out of bounds because numel(k)=0.

Error in ==> draw_prior_density at 93
binf = abscissa(k(1));

Error in ==> plot_priors at 96
[x,f,abscissa,dens,binf,bsup] = draw_prior_density(i,bayestopt_);

Error in ==> dynare_estimation_1 at 87
plot_priors(bayestopt_,M_,options_)

Error in ==> dynare_estimation at 62
dynare_estimation_1(var_list,varargin{:});

Error in ==> DSGE at 358
dynare_estimation(var_list_);

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

It's hard to tell without having a model-file, but usually it means that a beta prior is not specified correctly. As a beta distribution is bounded between 0 and 1, a mean of 0.5 is e.g. incompatible with a variance of 0.5 as some values would have to be outside the support. Try to decrease the variance of all beta priors and see if it works then.

Thank you for your help!
I find some beta' distribution variance is set equal to 1.