When copying an artifact we have a 500 error and the following log:
2018/08/30 13:04:50 [error] 10632#0: *26730 FastCGI sent in stderr: "PHP message: PHP Catchable fatal error: Argument 1 passed to Tuleap\Tracker\Artifact\ExistingArtifactSourceIdFromTrackerExtractor::__construct() must be an instance of Tuleap\Tracker\DAO\TrackerArtifactSourceIdDao, instance of Tracker_ArtifactFactory given, called in /usr/share/tuleap/plugins/tracker/include/Tracker/Tracker.class.php on line 3647 and defined in /usr/share/tuleap/plugins/tracker/include/Tracker/Artifact/ExistingArtifactSourceIdFromTrackerExtractor.php on line 36" while reading response header from upstream, client: 37.70.194.196, server: example.com, request: "POST /plugins/tracker/?tracker=376&func=submit-copy-artifact HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "example.com", referrer: "https://example.com/plugins/tracker/?func=copy-artifact&aid=39759"