error with fixed point conversion

I'm working with Matlab 2013a and I can't run HDL coder fixed point conversion I checked the presence of the Fixed point designer tool and it's installed. I don't now what's the problem

Thanks for reply

Answer 1

[Kiran Kintali]

please provide an example project with reproduction steps.

[Ikram Jaouadi]

here is an example of function

function y = add( a,b )
  y=a+b;
end

when I try Hdl coder with fixed point I get what you can see in attached file

Even when I try to work with Matlab function block in Simulink I get the same problem