May I know the version you’re using?
We have an outdated script on Github which we no longer maintain. If you’re using our UB Data Migration Lite version, please note:
-- The Lite version is available for Magento 2.0.7 only; and your Magento 2.0.7 must be a fresh installation.
-- It is not ready for NGINX web server
-- And it uses the old codebase and comes with limited feature sets, compared to our Pro version.