How to Call simulannealbnd from a function

Hi, I am trying to call simulannealbnd in a function. And I am getting the following error.

Error using simulannealcommon (line 42) You must provide an initial point.

When I call simulannealbnd from the workspace, it works fine. I wonder what is the problem. Here is the code snippet that I am using.

fitfunc=['@(w,X,T)mean(power(T-(' str1 '),2))']; parameterized_objective=str2func(fitfunc); ObjectiveFunction=@(w)parameterized_objective(w, X, T); LB=params.LB; UB=params.UB; W0=rand(1,5); [coefs,cost] = simulannealbnd(ObjectiveFunction,W0);