ios - getting __ as Identifier in firebase ( login in using facebook) swift -


i put fbsdklogin button , i'm integrating facebook firebase application.

func loginbutton(_ loginbutton: fbsdkloginbutton!, didcompletewith result: fbsdkloginmanagerloginresult!, error: error!)       {     let credential = firfacebookauthprovider.credential(withaccesstoken: fbsdkaccesstoken.current().tokenstring)     print(credential)     firauth.auth()?.signin(with: credential, completion: { (user, error) in         if (error != nil)         {             print(error)             return         }         print (user?.email)  // it's nil     } ) } 


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