Error: "Member breakdown". Wizard not adding access levels any longer.

Hi,

please I was using the wizard to set the very first steps of hte membership plugins, when my connection was interrupted.

Now in the dashboard I get this message "Member breakdown", and when I use the wizard, it doesn't create access levels any longer. I uninstalled the plugin, deleted it, and installed it again. The database looks empty. Yet, that error is there, and wizard is not functioning as expected.

Please help.
Thank you
Letizia