这个问题通常发生在使用Facebook SDK的项目中，原因是缺少引入Facebook SDK中的头文件或者缺少相关的框架。 可以尝试引入如下的框架：

#import 
#import 

并在AppDelegate.m中添加如下代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [[FBSDKApplicationDelegate sharedInstance] application:application
                             didFinishLaunchingWithOptions:launchOptions];
   // Override point for customization after application launch.
    return YES;
}

// FacebookSDK
- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation {
    BOOL handled = [[FBSDKApplicationDelegate sharedInstance] application:application
                                                                      openURL:url
                                                            sourceApplication:sourceApplication
                                                                   annotation:annotation
                    ];
    // Add any custom logic here.
    return handled;
}