ios - Quickblox unrecognized selector sent -

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i try register in quickblox twitter digits error 

+[qbrequest loginwithtwitterdigitsauthheaders:successblock:errorblock:]: unrecognized selector sent class 0x1002c8e70

i tried many different methods resolve problem 

public static func createuserbyphonenumber(phonenumber: string, completion: ((error: nserror?) -> ())?) {     let configuration = dgtauthenticationconfiguration(accountfields: .defaultoptionmask)     configuration.phonenumber = phonenumber     digits.sharedinstance().authenticatewithviewcontroller(nil, configuration: configuration) { (session, error) in         if error == nil {             let oauthsigning = dgtoauthsigning(authconfig: digits.sharedinstance().authconfig, authsession: session)             createquickbloxuser(oauthsigning.oauthechoheaderstoverifycredentials(), completion: { (error) in                 if error == nil {                     completion?(error: nil)                 } else {                     completion?(error: error)                 }             })         } else {             print(error.localizeddescription)             completion?(error: error)         }     } }  private static func createquickbloxuser(headers: [nsobject : anyobject], completion: ((error: nserror?) -> ())?) {     qbrequest.loginwithtwitterdigitsauthheaders(headers, successblock: { (response, user) in         if response.success {             print("user created")         }         }) { (errorresponse) in             if errorresponse.error?.error != nil {                 completion?(error: errorresponse.error?.error)             }     } }

i resolved problem add of -objc in setting of project


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