ios – Apple Mach-O Linker错误,我不知道该怎么办

ld: warning: directory not found for option '-F/Users/bbrAndy95/Documents/Broken Brandsonic Web Projects/Brandsonic Web mobile/../../Downloads/0.2.1gm1/iphoneos4.0/System/Library/Frameworks'
Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_NSURLrequest",referenced from:
      objc-class-ref in Brandsonic_Web_mobileAppDelegate.o
      objc-class-ref in Brandsonic_Web_mobileViewController.o
  "_OBJC_CLASS_$_NSAutoreleasePool",referenced from:
      objc-class-ref in main.o
  "_objc_msgSendSuper2",referenced from:
      -[Brandsonic_Web_mobileAppDelegate dealloc] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileViewController didReceiveMemoryWarning] in Brandsonic_Web_mobileViewController.o
      -[Brandsonic_Web_mobileViewController dealloc] in Brandsonic_Web_mobileViewController.o
  "_objc_setProperty",referenced from:
      -[Brandsonic_Web_mobileAppDelegate setWindow:] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileAppDelegate setViewController:] in Brandsonic_Web_mobileAppDelegate.o
  "__objc_empty_vtable",referenced from:
      _OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
      _OBJC_CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
      _OBJC_@L_489_3@CLASS_$_SecondView in SecondView.o
      _OBJC_CLASS_$_SecondView in SecondView.o
  "_objc_msgSend",referenced from:
      _main in main.o
      -[Brandsonic_Web_mobileAppDelegate application:didFinishLaunchingWithOptions:] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileAppDelegate dealloc] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileAppDelegate GOOGLE] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileAppDelegate YOUTUBE] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileAppDelegate WIKI] in Brandsonic_Web_mobileAppDelegate.o
      -[Brandsonic_Web_mobileViewController webView:shouldStartLoadWithrequest:navigationType:] in Brandsonic_Web_mobileViewController.o
      ...
  "__objc_empty_cache",referenced from:
      _OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
      _OBJC_CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
      _OBJC_@L_489_3@CLASS_$_SecondView in SecondView.o
      _OBJC_CLASS_$_SecondView in SecondView.o
  "_OBJC_CLASS_$_NSObject",referenced from:
      _OBJC_CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
  "___CFConstantStringClassReference",referenced from:
      CFString in Brandsonic_Web_mobileAppDelegate.o
      CFString in Brandsonic_Web_mobileAppDelegate.o
      CFString in Brandsonic_Web_mobileAppDelegate.o
      CFString in Brandsonic_Web_mobileViewController.o
      CFString in Brandsonic_Web_mobileViewController.o
      CFString in Brandsonic_Web_mobileViewController.o
      CFString in Brandsonic_Web_mobileViewController.o
      ...
  "_OBJC_CLASS_$_NSKeyedUnarchiver",referenced from:
      objc-class-ref in Brandsonic_Web_mobileViewController.o
  "_OBJC_CLASS_$_NSUserDefaults",referenced from:
      objc-class-ref in Brandsonic_Web_mobileViewController.o
  "_OBJC_CLASS_$_NSURL",referenced from:
      objc-class-ref in Brandsonic_Web_mobileAppDelegate.o
      objc-class-ref in Brandsonic_Web_mobileViewController.o
  "_OBJC_@L_489_3@CLASS_$_NSObject",referenced from:
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileAppDelegate in Brandsonic_Web_mobileAppDelegate.o
      _OBJC_@L_489_3@CLASS_$_Brandsonic_Web_mobileViewController in Brandsonic_Web_mobileViewController.o
      _OBJC_@L_489_3@CLASS_$_SecondView in SecondView.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command Failed with exit code 1 (use -v to see invocation)
'

我该如何解决？请帮忙。