something wrong in my program by using GData xmlsupport

Ld build/Debug-iphonesimulator/newParser.app/newParser normal i386     cd /Users/apple/Desktop/newParser     setenv MACOSX_DEPLOYMENT_TARGET 10.5     setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"     /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk -L/Users/apple/Desktop/newParser/build/Debug-iphonesimulator -F/Users/apple/Desktop/newParser/build/Debug-iphonesimulator -filelist /Users/apple/Desktop/newParser/build/newParser.build/Debug-iphonesimulator/newParser.build/Objects-normal/i386/newParser.LinkFileList -mmacosx-version-min=10.5 -lxml2 -framework Foundation -framework UIKit -framework CoreGraphics -o /Users/apple/Desktop/newParser/build/Debug-iphonesimulator/newParser.app/newParser     Undefined symbols:       "_kGDataXMLXPathDefaultNamespacePrefix", referenced from:           _kGDataXMLXPathDefaultNamespacePrefix$non_lazy_ptr in GDataXMLNode.o          (maybe you meant: _kGDataXMLXPathDefaultNamespacePrefix$non_lazy_ptr)     ld: symbol(s) not found     collect2: ld returned 1 exit status
 
 
Remove #import "GDataXMLNode.h" from precompiled header (and from .h files included there) and add it only in implementation files where needed. 
 
http://stackoverflow.com/questions/2926777/something-wrong-in-my-program-by-using-gdata-xmlsupport 

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