Google/calendar problem

I have my gmail calendar synced with the calendar on my macbook pro. I have the latest OS.

Recently, this calendar called "new calendar" has been added to my list of google calendars. I did not make this calendar and I can't seem to delete it. If I delete it, it comes right back.

The annoying thing, along with this new calendar is that I keep getting this warning message, constantly, that says:

The servr responded with an error

http://calendar.google.com/calendar/dav/

(my email address)/user/ is not a location that

supports this request.

Then I have to click and close that thing out and it is getting really frustrating.

I noticed this happend with the last OS update that was required.

How can I get this to stop? Any help would be appreciated.