No function or variable 'DCWmodel' defined.

[Karasjok]

hi, I encountered an error when I was running your code. And I don't konw what should I do.

An error method2>@(params)DCWmodel(params,rho_two,phi_CW_n),
Error FminSearch (Line 200)
fv (:, 1) = funfcn (x, varargin {that});
Error Method2 (Line 215)
params = fminsearch (fun, start_point, options);

I'm new, so please forgive me.