Topology optimization on a turbofan engine fan blae

Hello, I am a new user to hyperworks, I am a student and currently doing a project on topology optimization on an engine fan blade, I have gone through the tutorials and built up my model, but I have some problems to create the results of topology optmization, basicly my model has two structures, one external structure (Non-design) and one internal structure(design) and they are meshed seperately, I am trying to optimize the internal strucure while under centrifugal load and aerodynamic load, therefore I set the external structure as the constraint, and applied aerodynamic load and centrifugal load on the structure,  I received an error message when I was creating the result, can anyone help me check what is the problem? The message is :' Invalid design problem. All the sensitivities of response 1 (objective) are zero.' I have attached my model file, please help me take a look which part is incorrect to get the result. Thanks a lot.

Unable to find an attachment - read this blog