Odd notification / NSCFDictionary error

[Chad Armstrong]

I have an application which loops an arbitrary number of times  
(depending on the number of files being handled), which calls an  
NSTask.  I'm encountering an odd error with pre-Leopard systems where  
if my program loops around 200 times, the following error is called.

2007-11-26 13:43:29.137 MyApp[3595] Exception raised during posting of  
notification.  Ignored.  exception: *** -[NSCFDictionary  
setObject:forKey:]: attempt to insert nil value

I've done some research, but I cannot find anything which seems to pin  
point this particular problem.  My guess is that this error is being  
thrown when an NSTaskDidTerminateNotification is called after the task  
is complete.  What I've been able to dig up on this "notification  
exception" might be related to "too many files being opened at once".

Another odd thing about this situation is that I cannot reproduce the  
problem on Leopard.  However, on earlier systems (Tiger, Panther, and  
Jaguar), the problem exists.  This is a pre-existing issue, so it is  
not something that happened after building on Leopard or anything  
along those lines.

In my code, I also do make one call to an NSMutableDictionary, which  
does have a [NSDictionary setObject: forKey:] call, but that doesn't  
seem to be the source of the problem since I eliminated that code, and  
the problem persists.

Any ideas?

Regards,

Chad