why NSMutableArray Always error when allo init autorelease at init class?

Somewhere on .h I put

@property (nonatomic, retain) NSMuta开发者_C百科bleArray * BusinessQueue;

-(BNUtilitiesQuick *) init {
        if (!(self = [super init]))
        {
            return nil;
        }//if the superclass is NSObject, this must be init
        self.locationManager = [[[CLLocationManager alloc] init]autorelease];
        BusinessQueue = [[[NSMutableArray alloc]init]autorelease]; 
        return self; //and return the object itself
    }

The way I see it BusinessQueue = [[[NSMutableArray alloc]init]autorelease]; will make reference count 1. 1 for alloc. -1 for autorelease (sometimes latter) and 1 because BusinessQueue is a retain property.

However, BusinessQueue will get deallocated sometimes usually.

Why BusinessQueue always error but location manager doesn't

any wrong code? or NSMutableArray Can't be declared at init class?

---

BusinessQueue is not a property. self.BusinessQueue may be, if you defined it that way.

Added:

And the best/simplest way to do the initialization is:

self.businessQueue = [NSMutableArray array];