This might just be that you had a connection that was deleted and it is trying to recover your settings. If you ignore the error are you able to continue with the wizard.
The "0" alert in Database Search was leftover from me debugging an issue. I've removed it and uploaded a new build, but it can be ignored until you do a reinstall of the extension.
If you send me a US phone number or Skpe contact information I can give you a call and do screen sharing to make sure you are able to get through the database pages wizard.
