der_wille_zur_macht
Team RC
I've never had that error so I don't know how to fix it. If you'd like, PM me an email address and I'll send you a sketch that lets you test the DS1307 without use of any library.
For those working on an Arduino who want an RTC but don't want to shell out $20 for Sparkfun's version OR build their own breakout, here's an alternative:
http://www.seeedstudio.com/depot/electronic-brick-real-time-clock-moduleds1307-p-491.html?cPath=35
Never used it but just saw it and thought it might be attractive.