PDF conversion is executed in a program launched by MarkLogic Server and is protected by a limited-duration license key generated when the conversion program launched. If the key is checked after it expires, this error will be raised. Usually this is a sign that the host is overloaded, causing an excessive delay between launch and execution.
Response
Check the overall load and health of the host. You may need to adjust ingestion rates in your application to avoid overwhelming it. PDF conversion is expensive in terms of CPU and disk I/O.
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Stack Overflow: Get the most useful answers to questions from the MarkLogic community, or ask your own question.