iOS奇怪的错误:dyld:未找到符号:__ dealloc？

我突然得到以下错误,这不允许任何应用程序在模拟器中运行.该应用程序崩溃了.

dyld: Symbol not found: __dealloc
  Referenced from: /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
  Expected in: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk/usr/lib/libobjc.A.dylib
 in /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation

请指教!