Xcode Question

1. (null): Symbol(s) not found for architecture arm64

(null): -[TKLinkEditViewController saveLinkButtonClick:] in TKLinkEditViewController.o
(null): Symbol(s) not found for architecture arm64

http://stackoverflow.com/questions/27631758/symbols-not-found-for-architecture-armv7-in-ios-8

上面链接是一种解决方法，但是我的问题是.h和.m里面定义的外部变量名字不一致。
.h
extern NSString *const kBusinessCardUpdateexternalLinkListKey;
.m
NSString *const kBusinessCardUpdateExternalLinkList = @"externalLinkList";