Undefined symbols for architecture i386 hatasi

Merhaba bu hatayi aliyorum Ama duzeltemedim ne yapmam lazim ?

Undefined symbols for architecture i386:

  "_OBJC_CLASS_$_AFHTTPRequestOperation", referenced from:

      objc-class-ref in EBImageDownloader.o

      objc-class-ref in libPods-AFNetworking.a(AFHTTPRequestOperationManager.o)

      objc-class-ref in libPods-AFNetworking.a(UIImageView+AFNetworking.o)

      objc-class-ref in libPods-AFNetworking.a(UIButton+AFNetworking.o)

      objc-class-ref in libPods-AFNetworking.a(UIWebView+AFNetworking.o)

     (maybe you meant: _OBJC_CLASS_$_AFHTTPRequestOperationManager)

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)