There is D6 fatal PHP code in this module; It calls taxonomy_node_get_terms(), which just flatly does not exist in D7.
To create the failure: Create a mapping which maps a taxonomy term from the feed definition node to a term field on the target node as in this screenshot:
Then run a feeds import, perhaps with "drush cron".
You end up with an error like
Error: Call to undefined function taxonomy_node_get_terms() in sites/all/modules/feeds/mappers/taxonomy.inc, line 30
Several contributors have collaborated to provide a patch, rerolled in #82, and which includes a test.
Module maintainers and others should review and test the patch to make sure it does what it is supposed to and nothing else.
Original report by dasjo
taxonomy_feeds_get_source uses taxonomy_node_get_terms() which doesn't work anymore with drupal 7:
An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: /batch?id=9&op=do StatusText: OK ResponseText: Fatal error: Call to undefined function taxonomy_node_get_terms() in /feeds/mappers/taxonomy.inc on line 31
this happens as taxonomies are stored in fields for drupal 7