Ugly Fatal Error when attempting to uninstall module

After testing the module and then attempting to uninstall from Drupal (removing all containers/classes, then disabling module, then going to Uninstall and choosing to uninstall the module, it throws a PHP error on the site and won't uninstall:

Fatal error: Call to undefined function storage_selector() in /sites/all/modules/storage_api_stream_wrapper/storage_stream_wrapper.module on line 14