将Zxing lib（http://code.google.com/p/zxing/）集成到我的Iphone项目中时出现以下错误
#import "QRCodeReader.h"
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include/c++/4.2.1/bits/basic_string.h
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include/c++/4.2.1/bits/basic_string.h:772:34: error: too few arguments provided to function-like macro invocation [2]
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/include/c++/4.2.1/bits/basic_string.h:781:32: error: too few arguments provided to function-like macro invocation [2]
/ Developer / Platforms /.../ 4.2.1 / bits / basic_string.h：801：39：错误：为函数式宏调用提供的参数太少[2]
等...
有什么想法吗？
我正在使用XCode 4.2和Ios SDK 5.0