This does not appear to be a valid Repository Database. Please select a different database.
When going through the MNSP Console Setup Wizard, select any option for the QuestRepository.nsf file to complete the wizard. After the wizard is complete, right-click on Migrator for Notes to SharePoint at the top of the left-hand pane in the console. Select Advanced Configuration Options… | Notes | Configure Repository Database…
In the release of MNSP 6.10.0 issue Git# 567 has been resolved.