Error message in Windows Live email about calendar unable to update

I keep getting this message "There was an error when attempting to connect to the Windows Live Calendar service. If the error persists, check to see if there's an upgrade of Windows Live Mail available or contact a service representative." everytime I open my Windows Live Email. My email works fine, I just keep getting this message and have to hide it everytime. I am NOT trying to use the calendar, this message just comes up. How do I get rid of that error message. What do I have to change? In simple computer language, please, as I am not a great wiz at this. Thank you SO much!