Swift Xcode Error : Apple Mach-O Linker Error - ios

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 ?

Clean build your project. Rebuild.

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