How can I implement PID controller at both RSC & GSC of grid connected DFIG without any error?

Hello, I'm trying to replace buit in RSC & GSC controller with PID controller and continuesly getting multiplies errors. Anyone can suggest me how can I modify without error of defaulted controller in: https://www.mathworks.com/matlabcentral/fileexchange/72261-damping-subsynchronous-resonance-of-wind-farm-dfig-by-tcsc