iOS 集成环信3.0报错

Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_EMChatVoice", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMChatVideo", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMChatImage", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMChatImageOptions", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMChatLocation", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMChatText", referenced from:
      objc-class-ref in EaseSDKHelper.o
  "_OBJC_CLASS_$_EMRobot", referenced from:
      objc-class-ref in RobotManager.o
     (maybe you meant: _OBJC_CLASS_$_EMRobotChatTextBubbleView)
  "_OBJC_CLASS_$_EaseMob", referenced from:
      objc-class-ref in EaseConversationListViewController.o
      objc-class-ref in RobotManager.o
      objc-class-ref in AppDelegate+LocalPush.o
      objc-class-ref in AppDelegate.o
      objc-class-ref in EaseUsersListViewController.o
      objc-class-ref in EaseMessageViewController.o
      objc-class-ref in EaseSDKHelper.o
      ...
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)