The error object returned after an unsuccessful request.
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A string that describes the reason for the unsuccessful request. The string consists of a single allowed value.
error field contains exactly one of the following parameters:
The request is malformed, normally due to a missing parameter, contains an unsupported parameter, includes multiple credentials, or uses more than one mechanism for authenticating the client.
The client authentication failed.
The authorization grant or refresh token is invalid.
The client is not authorized to use this authorization grant type.
The authenticated client is not authorized to use the grant type.
The requested scope is invalid.