How do I pass a function handle to a function I created? Error: Undefined function 'SpecAnl' for input arguments of type 'function_handle'

I have created a function 'SpecAnl' and want to pass a function handle to one of its variables. My anonymous function is defined:

func=@(t) 1+cos(pi*t)+2*sin(2*pi*t);

and my function 'SpecAnl' is written:

function [a,b]=SpecAnl(x,T,dt,h)

c=zeros(h+1,1);
a1=0;
t0=0;
for k=1:(h+1)
  for n=1:ceil(T/dt)
    a1= a1 + dt/T*x(t0)*exp(-2j*pi*k*t0/T);
    t0= t0 + dt;
    if n==floor(T/dt)
      a2=a1;
    end
    c(k)=(a1+a2)/2;
  end
a=2*real(c);
b=-2*imag(c);

My function is saved in the main path. When I call

SpecAnl(func,...

from the command window, I get the following message:

Undefined function 'SpecAnl' for input arguments of type 'function_handle'.