Required code signature missing for a library

Question

I am using Swift 3.0 in Xcode 8 and facing this error when running my app. I have used third party library SlideMenuController.

When I run my app I encounter this er

Answer 1

I had same issue with my mac10.12.5 & Xcode 9, There seems to be issue with existing data at derived data location SO better just remove your derived data either by :

XCode>Prefrences>Locations>click on arrow at Derived Data location & delete it.

or either by writing this command on terminal: Make sure your xcode is in application or you mention your xcode location :

rm -rf ~/Library/Developer/Xcode/DerivedData

Now Open XCode, run application. Hopefully, problem will be resolved. Good luck...