Debugging confluence migration import

I’'m trying to migrate away from Confluence using the Confluence Migrator. There are several spaces, three of which contain 2,000+ pages. When I migrate the big spaces I see “Error has been found during the conversion”. The job log shows that some pages have been created but there are clearly some pages with something wrong. Is there any way I can find out which page is causing an error? I think the “Created document” log entry only shows when a page is successfully parsed. I need to be able to see which page the parser has started work on before the error occurs.