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NSTimer issue, NSCalendarDate issue

I have a non-repeating NSTimer that is in the same method that it's calling. The NSTimer is initiated by a button-click and I need to stop it with a button click.

At [theTimer invalidate]; I get an out-of-scope runtime error, I believe this is because since it's non-repeating, it's already invalidated by the time the user clicks the button, but continues to repeat because it's always calling itself.

NSCalendarDate issue:
another error appears at adjust = [fireDate timeIntervalSinceDate:[NSCalendarDate calendarDate]];

it says it is out of scope also(I have to comment this line out to arrive at the other error). I really haven't a clue why. adjust is a value I want to subtract from TIMER_INTERVAL to ensure better timer accuracy. This is the output:

2004-06-27 09:56:31.018 NiceTimer[6803] updatemywindow.
2004-06-27 09:56:31.125 NiceTimer[6803] updatemywindow.

NiceTimer has exited due to signal 11 (SIGSEGV).

any suggestions would be greatly appreciated.
Michael

code:

- (IBAction)startStopTimer:(id)sender
{

NSCalendarDate *now;
NSCalendarDate *due;
if([[myButton title] isEqual:@"Start"])
{
// calculate seconds for both duration and interval
[self calculateSeconds];

if([self validateTimes])
{
theSignal = [[Signal alloc] init];

now = [NSCalendarDate calendarDate];
due = [now dateByAddingYears:0 months:0 days:0 hours:0 minutes:0 seconds:gIntervalSeconds];

[theSignal setInitialDate:now];
[theSignal setDueDate:[now dateByAddingYears:0 months:0 days:0 hours:0 minutes:0 seconds:gIntervalSeconds]];
[theSignal setNumberOfSignals:((int)gDurationSeconds/gIntervalSeconds)];
NSLog(@"theSignal: start: \n%@ \ndue: \n%@\n numSignals:%d",[theSignal initialDate], [theSignal dueDate], [theSignal signals]);
[myButton setTitle:@"Stop"];
if(countDownwards==YES)
[clockView setString:[NSString stringWithFormat:@"%f",[now timeIntervalSinceDate:[theSignal dueDate]]]];
else
[clockView setString:[NSString stringWithFormat:@"%f",[due timeIntervalSinceDate:[theSignal initialDate]]]];
[self disableSettings];
// [NSString stringWithFormat:@"0%d:",aMin]

theTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL target:self selector:@selector(updateMyWindow:) userInfo:nil repeats: NO];
}
}
else {

if(theTimer != nil) {
[theTimer invalidate]; /* debugger says this object is out of scope */ ///////////////
}
[myButton setTitle:@"Start"];
NSLog(@"got here startstop 1");
[self enableSettings];

}

}

- (void)updateMyWindow:(NSTimer *)aTimer
{
double adjust;

NSLog(@"updatemywindow.");

if(fireDate)
{
adjust = [fireDate timeIntervalSinceDate:[NSCalendarDate calendarDate]]; /* debugger says this var is out of scope */ ///////////////
NSLog(@"adjust: %f", adjust );
}

fireDate = [NSCalendarDate calendarDate];
aTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL target:self selector:@selector(updateMyWindow:) userInfo:nil repeats: NO];
//[aTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:TIMER_INTERVAL]];
}
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