Error for new users?

[Some14u]

I have the following message after clicking "import" button:
"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 for more information."
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error: "idpiframe_initialization_failed"

I'm using a simple example template from the main description of repository.