"The object store that is used by this note was not found or is not Notes database" getting this

Hello notes gurusOne of the user is unable to see his calendar view. Its empty. And the action button bar(in calender is as same as the Mail.

I created several test entires in the calender from Create Calender Entry menu but cant find anything.

I tried to create a copy in local pc, at the end of copying i got the message “The object store that is used by this note was not found or is not Notes database”.

I also tried to refresh and replace design but still the same.