Oracle® Database 11g / 12c / 18c error codes EXP-00007: dictionary shows no columns for [string].[string]

EXP-00007: dictionary shows no columns for [string].[string]

Oracle Error Code: EXP-00007

Cause: Export failed to gather column information from the data dictionary. The table may have been dropped.

Action: Retry the export and, if this error recurs, report it as an Export internal error to customer support.