Evolution - Calendar

[Spats]

I have come across this problem with Evolution Calendar. I put some recurring events in my calendar but when I deleted some I could not put an event back in for that day .. When I doubled clicked on the date it comes up with the following ....

Cannot create a new event - The calendar you have selected is read only

Is there some way around this or is it a bug ? Any help or suggestions welcome.

Thank you

[Spats]

Please disregard my post for this problem . I have found what was causing that and fixed it .
When Calendar open it open up "Contacts - Birthdays and Anniversaries" instead of "On this computer - Personal" which is the one I should be in ....
Thank you all