I am trying to design a fuzzy controller for an ac servo motor in
simulink. I am trying to use the Fuzzy control toolbox. I will have 2
inputs and one output for the fuzzy controller. Error and change in
error. I am trying to use the Fuzzy controller in toolbox. But my
problem is that it only has one input, one output system. How do i
change it? Is there any other way to go about it?
Any help would be greatly appreciated.

Can you generate the "change in error" input inside the fuzzy
controller itself?  Wouldn't that just be the derivativee (or
difference function, for discrete-time) of the error input?