Must always be present and set to
A plain-text human-readable explanation specific to this occurrence of the problem, providing specific information about why the error occurred in this particular case. This description must not include HTML or other markup.
A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced.
A short, human-readable summary of the problem type. It should not change from occurrence to occurrence of the problem, except for purposes of localization.
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