objective c - how to solve the duplicate symbol error in iphone -

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I have created an application. But when I run my application, I get 2 errors I can not understand the errors. 1 error is 

  command / developer / usr / bin / mapc with exit code 6 failed   
 and other error duplicate symbol ie  
  ld: Warning: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/usr/lib/system/libSystem.host.dylib ld dylib Copy: copy symbol _OBJC_IVAR _ $ _ .webView and / users / rajinair / desktops / trunk / creation / postpreviewViewController /Users/rajinair/Desktop/trunk/build/WordPress.build/Debug-iphonesimulator/WordPress.build/Objects-normal/i386/PostPreviewViewController-27138F5DB4996E35.o WordPress .build / debug-iphonesimulator / wordpress.build / items normal / i386 / postprice ViewViewController-27138F5DB4996E35.o Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-gcc-4.2 Exit Code 1   
 What could be the problem Please do not understand this problem. Please help me solve the problem.   
 
 
  PostExviewController.Webview  is defined multiple times. Postal Kode.

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