'Unable to access protocol methods via delegate

While accessing protocol methods via delegate I'm getting following error: "No known instance method for selector 'lostConnection'"

Swift Protocol:

@objc protocol GameDelegate {
    func lostConnection()
}

Objective C game file

//game.h

@protocol GameDelegate;
@interface SSStreamManager : NSObject 

@property (assign) id<GameDelegate> delegate

@end

Getting error while calling protocol methods

[self.delegate lostConnection]; // No known instance method for selector 'lostConnection'

Sources

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Solution	Source