aol calendar stopped syncing, running android 4.4.2

[lhb02]

My aol calendar stopped syncing to the default calendar app in android 4.4.2 (kitkat). All present & past months are blank. When I opened settings, went to accounts, caldav no longer appeared. Went to application manager & saw it is still installed. Under "Launch By Default," says "No defaults set" which is grayed out. I see no way to change this setting. However, under permissions, it shows that it runs at startup. & I see that it is running. Any idea as to why account was deleted and if update no longer works with android 4.4.2? If I add the caldav account, anyone know the url to obtain the calendar?