在'@'之後期待一個objective-c指令

我在我的項目中集成了XMPP框架。當我編譯項目時，我在XMPPGroupCoreDataStorageObject.h類中遇到了一個問題，例如expected an objective-c directive after '@' 。在'@'之後期待一個objective-c指令

//XMPPGroupCoreDataStorageObject.h 

#import <Foundation/Foundation.h> 
#import <CoreData/CoreData.h> 



@class XMPPUserCoreDataStorageObject; 
@interface XMPPGroupCoreDataStorageObject : NSManagedObject { 
@private 
} 
@property (nonatomic, strong) NSString * name; 
@property (nonatomic, strong) NSSet* users; 
+ (void)clearEmptyGroupsInManagedObjectContext:(NSManagedObjectContext *)moc; 
+ (id)fetchOrInsertGroupName:(NSString *) groupName inManagedObjectContext:(NSManagedObjectContext *)moc; 
+ (id)insertGroupName:(NSString *) groupName inManagedObjectContext:(NSManagedObjectContext *)moc; 


@end

雖然編譯我有問題的代碼，請在截圖看看 enter image description here