Warnings after enabling

This warnings occur every time a save button is clicked.

Notice: Undefined index: wizard classes in migrate_ui_wizards() (line 156 of /home/xxxxxx/public_html/xxxx/sites/all/modules/migrate/migrate_ui/migrate_ui.module).
Warning: Invalid argument supplied for foreach() in migrate_ui_wizards() (line 156 of /home/xxxxxx/public_html/xxxx/sites/all/modules/migrate/migrate_ui/migrate_ui.module).

Thanks