knotes not working correctly

As stated notes is not working correctly. It opens and I can add notes from clipboard and from email, but when I open it again notes are not there.
If I try to add a NEW note the application crashes every time with something called ‘kongi’ failed.

I have notes from 15.0 & 15.1 that do not show. The section that indicates ‘show all notes’ continuously is grayed out.

Is there any way I can retrieve the previous notes?

Is there a known KDE problem with knotes in Leap15.2?

I would hope the upgrade to 15.2 would not completely obliterate previous data(but then what do I know about it).