Swift Xcode Error : Apple Mach-O Linker Error

Question

Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_PFLogInViewController", referenced from:
  __TMaCSo21PFLogInViewController in ViewController.o
"_OBJC_CLASS_$_PFSignUpViewController", referenced from:
  __TMaCSo22PFSignUpViewController in ViewController.o
"_OBJC_CLASS_$_PFUser", referenced from:
  __TMaCSo6PFUser in LoginViewController.o
  __TMaCSo6PFUser in ViewController.o
  __TMaCSo6PFUser in signUpViewController.o
"_OBJC_CLASS_$_Parse", referenced from:
  __TMaCSo5Parse in AppDelegate.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I'm having Apple Mach-O Linker Error from 1) "_OBJC_CLASS_$_PFLogInViewController", referenced from: 2) "_OBJC_CLASS_$_PFSignUpViewController", referenced from: 3) "_OBJC_CLASS_$_PFUser", referenced from: 4) "_OBJC_CLASS_$_Parse", referenced from: 5) linker command failed with exit code 1 (use -v to see invocation)

Can i know what is Apple Mach-O Linker Error and the way to solve this error ?

Answer 1

Clean build your project. Rebuild.