What do these messages mean and how can I fix them? They don't cause any problems but I'm really OCD about this type of stuff 
Disk Utility shows no issues.
I'd really like to fix them!
11/28/09 7:40:14 PM com.apple.WindowServer[59] Sat Nov 28 19:40:14 Boris.local WindowServer[59] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
11/28/09 7:38:20 PM com.apple.launchd.peruser.501[91] (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
11/28/09 7:38:20 PM com.apple.launchd.peruser.501[91] (com.apple.Kerberos.renew.plist[111]) Exited with exit code: 1
Disk Utility shows no issues.
I'd really like to fix them!