error in syncing OF to ical
 

It used to work fine, now I get this error:

Unable to synchronize with iCal:

Exception raised:
---------------------------
Name: NSInvalidArgumentException
Reason: *** -[NSNull urlInFile:]: unrecognized selector sent to instance 0xa0817020
Info:
{
NSStackTraceKey = "0x5be19a 0x9295ae3b 0x96fb434a 0x96fb294c 0x96fb2a12 0x5cffa 0x5d275 0x5d3b3 0x5d951 0x915b09ac 0x915b093d 0x915afebe 0x9146a76b 0x91437311 0x144640 0x91394d0f 0x14117b 0x91361f14 0x2e12 0x2d39 0x2";
}
Backtrace:0x5be19a 0x9295ae3b 0x96fb434a 0x96fb294c 0x96fb2a12 0x5cffa 0x5d275 0x5d3b3 0x5d951 0x915b09ac 0x915b093d 0x915afebe 0x9146a76b 0x91437311 0x144640 0x91394d0f 0x14117b 0x91361f14 0x2e12 0x2d39 0x2
---------------------------

Any ideas/ help welcome.

Nevermind. I found [url]http://forums.omnigroup.com/showthread.php?t=6648[/url] and reset sync data, and all is well again.