无法找到＆＃39; OSSubscriptionObserver＆＃39;的协议声明

Question

此代码

#if __has_include(<React/RCTBridgeModule.h>)
    #import <React/RCTBridgeModule.h>
    #elif __has_include("RCTBridgeModule.h")
    #import "RCTBridgeModule.h"
    #endif


#if __has_include(<OneSignal/OneSignal.h>)
#import <OneSignal/OneSignal.h>
#else
#import "OneSignal.h"
#endif

@interface RCTOneSignal : NSObject <RCTBridgeModule, OSSubscriptionObserver>

- (id)initWithLaunchOptions:(NSDictionary *)launchOptions appId:(NSString *)appId;
- (id)initWithLaunchOptions:(NSDictionary *)launchOptions appId:(NSString *)appId settings:(NSDictionary*)settings;
+ (void)didReceiveRemoteNotification:(NSDictionary *)dictionary;
@end

此问题或错误：

无法找到＆＃39; OSSubscriptionObserver＆＃39;的协议声明 谢谢你提前。 ：）