Thanks Frank for quick reply,
-I removed and deleted the version that had installed from wordpress plugin site
-I downloaded 2.6.2 version
-cleared the browser cache (I am using chrome for testing)
-loaded the page with calendar
I still get the fullcalendar.print.css not found error.
Also I tried to set a new schedule (on the front end), when I try to select a day from the popup calendar, it always shows 2013/12/31 as the selected date and not the day I select, and when I go to next page I am unable to select any of the available hours, so from then on I can't really continue since no hours can be selected.