I get the following error after integrating google login. kindly help

I did the following what was written in this docs : https://success.outsystems.com/Documentation/11/Developing_an_Application/Design_UI/Accelerators/Login_with_Google_Accelerator

to integrate google login on my login page of application but I am reciving the following error in console of browser . 

Error : 


  1. details: "You have created a new client application that uses libraries for user authentication or authorization that will soon be deprecated. New clients must use the new libraries instead; existing clients must also migrate before these libraries are deprecated. See the [Migration Guide](https://developers.google.com/identity/gsi/web/guides/gis-migration) for more information."
  2. error: "idpiframe_initialization_failed"


{"error":"Could not attach click handler to the element. Reason: element not found."}

I had an existing project in google developer console and a scope for user creation was already defined in it . kindly help me in solving this .

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