Error occurred during conversion while using Full Export Option in Confluence

Confluence provides two types of export option,

Full Export(Includes comments & attachments)
Custom Export(Includes comments)
From my part, custom export is successfully migrated.

But While i make Full Export, i provides below error

https://forum.xwiki.org/uploads/default/original/1X/c85f6cfb843dbbd5028ea5f72360d76567b4bd2d.png

Reason for checking full export option, is that it includes attachments where as in custom export, it does not include attachments.

For example(custom export)

Am attaching word document to a page in confluence.
After attach it will generate a download link.
Migrating page to XWiki.
XWiki displays the download link. Not the attachment.
And download requires Atlassian credentials.

Attached sample.zip file in task.