Does not run #2

I am struggling to get any of the examples to run at all.
In runDREAM_zs, it tries to set a path, but hard codes the directory delimiter for windows, and the directory name is miss spelt. Also it does not add the functions, data or post-processing directories. Better than a string is....

DREAM_dir = pwd;
EXAMPLE_dir = fullfile(pwd,'examples',['example_' num2str(example)]);
FUNCTION_dir = fullfile(pwd,'functions');
DATA_dir = fullfile(pwd,'data');
POST_dir = fullfile(pwd,'postprocessing');

% Add subdirectory to search path
addpath(EXAMPLE_dir);
addpath(FUNCTION_dir);
addpath(DATA_dir);
addpath(POST_dir);

... the at least everything can be found.

However, even then, trying to run it gives the error.....

Output argument "Best" (and maybe others) not assigned during call to "CompDensity".

Error in dream_zs (line 93)
[p,log_p,fx(:,1:MCMCPar.seq),MCMCPar.Best] = CompDensity(X,MCMCPar,Measurement,ModelName,Extra);

Error in runDREAM_ZS (line 319)
[Sequences,X,Z,output,fx] = dream_zs(MCMCPar,ModelName,Extra,ParRange);

Am I missing something in how to get this to run?

(I'm trying this in Matlab 2021a on a Mac...)