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アプリケーションをブルーイングしようとすると、これらのエラーが発生し続けます

Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_PayPalPayment", referenced from:
      objc-class-ref in ViewController.o
  "_OBJC_CLASS_$_PayPalPaymentViewController", referenced from:
      objc-class-ref in ViewController.o
  "_PayPalEnvironmentNoNetwork", referenced from:
      -[ViewController Pay:] in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
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