GMstepper build failed Swift

Question

Before this happened I have downloaded GMstepper library and put it in the project folder then I used UIVIEW and then make the class of it to GMstepper and this happened.

Answer 1

It is going to failed because the variables of IBInspectable are used in someone else IBDesignable class

I gave different name to my class clean project .then Select storyboard go to Editor menu and do Refresh All Views or else select Automatic Refresh view; wait for build to be completed

for more info please check IBDesignable Build Failed