Error: invalid_client The OAuth client was not found.

I watch youtube for integrating google dirve. i use the same process but when i click on authorize google drive after entering the keys it gives error,
(401: Error: inavlid_client, the OAuth client was not found). can you update the method for integrating google drive,b/c there are some other item now in google drive settings which was not present in the tutorial provided by you.