Error using fminunc function

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Hi I am getting the following erroe when using "fminunc" command.

The code seems to work fine when I run using fminsearch. Does anyone know what could be the problem?

x01=[a1,b1,c1,d1,a2,b2,c2,d2,5];

opts=optimset('display','iter','tolfun',1e-15,'maxfuneval',20000,'tolx',1e-15,'maxiter',10000);

%minimised_coeff =fminsearch(@my_func,x01, opts)

minimised_coeff=fminunc(@my_func,x01,opts)

The code seems to work fine when I run using fminsearch. Does anyone know what could be the problem?

                                                     First-order 
 Iteration  Func-count       f(x)        Step-size       optimality
     0          10          35345.4                      6.52e+04
Attempt to execute SCRIPT roots as a function:
/Users/XXn/Documents/MATLAB/roots.m
Error in lineSearch
Error in lineSearch
Error in lineSearch