The console should also contain information as to why it crashed. SIGABRT means an assertion failure.
For example I created a quick project that was meant to crash by creating an NSArray with 1 string in it, then requesting the string at index 5. Here is what appeared in the console. You will see that there is a reason for the crash at the top. That is what you are looking for.
Code:
2010-07-08 12:15:12.362 Untitled[9919:207] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[NSCFArray objectAtIndex:]: index (5) beyond bounds (1)'
2010-07-08 12:15:12.365 Untitled[9919:207] Stack: (
A bunch of number that I deleted in the post to keep it brief...
)
terminate called after throwing an instance of 'NSException'