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I have performed all steps of Oauth and successfully gotten the access token and other information.
But when i call api through this token gmail replay with login required error

Google code

func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!,
 withError error: Error!) 
 if let error = error 
 print("(error.localizedDescription)")
 // [START_EXCLUDE silent]
 NotificationCenter.default.post(
 name: Notification.Name(rawValue: "ToggleAuthUINotification"), object: nil, userInfo: nil)
 // [END_EXCLUDE]
 else 
 // Perform any operations on signed in user here.
 userRet.userId = user.userID // For client-side use only!
 userRet.idToken = user.authentication.idToken // Safe to send to the server
 userRet.fullName = user.profile.name
 userRet.givenName = user.profile.givenName
 userRet.familyName = user.profile.familyName
 userRet.email = user.profile.email
 userRet.accesstoken = user.authentication.accessToken
 userRet.accesstoken = user.serverAuthCode
 // [START_EXCLUDE]
 NotificationCenter.default.post(
 name: Notification.Name(rawValue: "ToggleAuthUINotification"),
 object: nil,
 userInfo: ["statusText": "Signed in user:n(userRet.fullName)"])
 // [END_EXCLUDE]

 

Api Call

@IBAction func getDataFromApi(_ sender: Any) 
 print(userRet.idToken + " " + userRet.email);
 Alamofire.request("https://www.googleapis.com/gmail/v1/users/"+userRet.accesstoken+"/profile").responseJSON response in
 print("Request: (String(describing: response.request))") // original url request
 print("Response: (String(describing: response.response))") // http url response
 print("Result: (response.result)") // response serialization result

 if let json = response.result.value 
 print("JSON: (json)") // serialized json response
 

 if let data = response.data, let utf8Text = String(data: data, encoding: .utf8) 
 print("Data: (utf8Text)") // original server data as UTF8 string