Question

My app crash for an indefined reason and I end up with this log:

MyProj[9442:707] -[NSDecimalNumber length]: unrecognized selector sent to instance 0x2e6690

Can I have any more details ? What does 9442:707 mean, is it a line number ?

EDIT

In my code, I have added traces like:

NSLog(@"KEYS:%@", myKeys);
NSLog(@"KEYS ORDERED:%@", [myKeys sortedArrayUsingSelector:@selector(compare:)]);

But the second line crashes. The “length” error I have seems to come from this line (I do not use [something length] anywhere though).

2011-11-11 14:20:18.936 MyProj[9570:707] KEYS:(
  330,
  359,
  362,
  367,
  352,
  351,
  364,
  331,
  350
)

... then crash... with above error

Answer 1

The iOS debugger is rather unclear in describing the exact problem sometimes.
Yet in your case it should be clear. [NSDecimalNumber length] cannot be executed because the method length us unclear to it.

Ref: http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSDecimalNumber_Class/Reference/Reference.html

Try finding the line where you use the length function and change it to something that does work. With a piece of code in your question we could be more precise on that.