Problems with lists

[Alessandro Perrone]

Hi all
 I have a little problem with Lists.
All I'd like to do is to cancel an object from List.
Here it is the methos I wrote

-destroyInefficient {
  id index, agent;
  int i;   
  index = [[modelswarm getFirmList] begin: [self getZone]] ;
  while ((agent = [index next])) {
  if (status !=1) {
    [[modelswarm getFirmList] remove: agent];
    [index remove];
    [agent drop];
                    }
         }// while
[index drop];
  return self;
}


Whats wrong? 
Gdb said to me
Program received signal SIGSEGV, Segmentation fault.
0x806d0dd in -[ListIndex(linked) _remove] (self=0x823a348, _cmd=0x8159e04)
    at List_GEN.m:433
and "where" command said
#0  0x806d0dd in -[ListIndex(linked) _remove] (self=0x823a348,
_cmd=0x8159e04)
    at List_GEN.m:433
#1  0x804d1cb in -[Firm destroyInefficient] (self=0x82378c0,
_cmd=0x8159e34)
    at Firm.m:67
#2  0x804d2a9 in -[Firm newFirms] (self=0x82378c0, _cmd=0x815a864) at
Firm.m:84
#3  0x807191b in -[Object(s) _perform:] (self=0x82378c0, _cmd=0x81628c0, 
    aSel=0x815a864) at DefObject.m:469
#4  0x805f18c in -[ActionTo(0) __performAction::] (self=0x8239048, 
    _cmd=0x8162bb0, anActivity=0x82204a8) at Action.m:208
#5  0x805f940 in -[Activity(c) __run:] (self=0x82204a8, _cmd=0x8162b98)
    at XActivity.m:162
#6  0x805f894 in -[Activity(c) __run:] (self=0x823a438, _cmd=0x8162b98)
    at XActivity.m:133
#7  0x805f894 in -[Activity(c) __run:] (self=0x823a260, _cmd=0x8]
(self=0x8239390

Waiting for your prompt reply, best regards.
                                ALEX






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