ASIHTTPRequest Error

gistfile1.m

Undefined symbols for architecture i386:
  "_objc_assign_ivar", referenced from:
      -[ViewController setTextField:] in ViewController.o
      -[ViewController setLabel:] in ViewController.o
      -[ASIAuthenticationDialog presentingController] in ASIAuthenticationDialog.o
      -[ASIDownloadCache setStoragePath:] in ASIDownloadCache.o
      -[ASIHTTPRequest releaseBlocksOnMainThread] in ASIHTTPRequest.o
      -[ASIHTTPRequest setRequestMethod:] in ASIHTTPRequest.o
      -[ASIHTTPRequest setURL:] in ASIHTTPRequest.o
      ...
  "_objc_assign_global", referenced from:
      +[ASIAuthenticationDialog initialize] in ASIAuthenticationDialog.o
      +[ASIAuthenticationDialog presentAuthenticationDialogForRequest:] in ASIAuthenticationDialog.o
      -[ASIAuthenticationDialog viewDidDisappear:] in ASIAuthenticationDialog.o
      +[ASIDownloadCache initialize] in ASIDownloadCache.o
      +[ASIDownloadCache sharedCache] in ASIDownloadCache.o
      +[ASIHTTPRequest initialize] in ASIHTTPRequest.o
      +[ASIHTTPRequest sessionProxyCredentialsStore] in ASIHTTPRequest.o
      ...
  "_objc_assign_strongCast", referenced from:
      -[ASIDataCompressor compressBytes:length:error:shouldFinish:] in ASIDataCompressor.o
      +[ASIDataCompressor compressData:error:] in ASIDataCompressor.o
      +[ASIDataCompressor compressDataFromFile:toFile:error:] in ASIDataCompressor.o
      -[ASIDataDecompressor uncompressBytes:length:error:] in ASIDataDecompressor.o
      +[ASIDataDecompressor uncompressData:error:] in ASIDataDecompressor.o
      +[ASIDataDecompressor uncompressDataFromFile:toFile:error:] in ASIDataDecompressor.o
      -[ASIHTTPRequest main] in ASIHTTPRequest.o
      ...
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)