There are a few reasons a PDF render would fail. One of the more easy solutions to try is to clear your plugin cache.
However if this does not solve the issue I suggest creating a support ticket by visiting https://support.atlassian.com
and providing a set of logs for the Support Engineers to review.
Please zip the following and attach to this ticket:
* <confluence_install>/logs/ (anything recent in this directory)
The <confluence_home> directory is the path defined in the following file: <confluence_install>/confluence/WEB-INF/classes/confluence-init.properties
Or better yet, please create a support zip at Confluence Admin>Atlassian Support Tools>Support Zip and attach it to this ticket.
Tin Nguyen | Confluence Support.
Note that the page name in the error message,
Failed during PDF export. Exception message - Exception thrown while rendering the page 'In Conclusion'
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