title: iOS 11 simulator dyld: Symbol not found: _CKAccountChangedNotification
body: <p>Does anyone know what happened for my iOS 11 simulator? When i launch on iOS 11, the app can't work, and says in console:</p>
  
  <pre><code>dyld: Symbol not found: _CKAccountChangedNotification
  
  Referenced from: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/CoreDuet.framework/CoreDuet
  
  Expected in: /Users/steve/Library/Developer/Xcode/DerivedData/Cloud-bvzzwfgkjzfnzibxrwadbayiowcu/Build/Products/Debug-iphonesimulator/CloudKit.framework/CloudKit in /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/CoreDuet.framework/CoreDuet"
  </code></pre>
  
  <p>But everything is fine when run in iOS 10 simulator or on the device with iOS 11. How can i fix this problem? Thanks in advance!</p>