I make authorization in VK by this video .

constantly pops up

{error: invalid_client, error_description; Client_ID IS IncorRect}

On the device there is an official VC client. I am authorized there. I tried to remove it – the same.
When this official client recorded again, there I was no longer authorized. At the same time, the authorization window also floated in my application.
When it was logged in to the official client, then the same error appeared in my application.

Answer 1, Authority 100%

to all who have the problem of error invalid_client error_description client_id is incorrect , you need to add to the manifest to the & lt tag; Application & GT; Line Android: name = ". Classname "where classname – the name of the class you inherited from android.app.application and in one of the methods of which the vksdk.initialize call occurs ();

Answer 2

I had such a problem, because I did not delete the colon in the SHA1 key when I registered the application in the developer panel in VK.