I cannot allocate a nsmutablearray as a class variable [closed] - objective-c

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I was having problem allocating the NSMutableArray in the player class, there is no warning in the compile time when I tried this way in the (id)init method: playerInventory = [[NSMutableArray alloc] init]; But when I run the program, it gives me an error (EXC_BAD_ACCESS). I have checked over and over, but found nothing help. I am new to objective c and I don't have much knowledge in memory management in this language. But seemed that I cannot find the answer after my best effort.
the .h file
#interface Player : NSObject
{
int playerLevel;
int playerExp;
NSMutableArray *playerInventory;
NSString *playerName;
BOOL isLastPlayerExist;
NSData *xmlData;
GDataXMLDocument *_xmlDoc;
}
#property (assign,readwrite) int playerLevel;
#property (retain,readonly) NSString *playerName;
#property (assign,readonly) BOOL isLastPlayerExist;
#property (retain,readwrite) NSMutableArray *playerInventory;
+(Player *)currentPlayer;
-(void)loadXMLFile;
-(void)loadRecentPlayer;
-(void)loadPlayerStats;
-(void)loadPlayerInventory;
-(void)releaseXMLFile;
#end
the .m file , deleted irrelevant implementations.
#implementation Player
static Player *sharedInstance = nil;
#synthesize playerLevel;
#synthesize playerName;
#synthesize isLastPlayerExist;
#synthesize playerInventory;
-(id) init{
self = [super init];
if (self != nil){
playerInventory = [[NSMutableArray alloc] init];
[self loadXMLFile];
[self loadRecentPlayer];
[self loadPlayerStats];
}
return self;
}
-(void) loadXMLFile{
NSString *filePath = [self dataFilePath: NO];
xmlData = [[NSMutableData alloc] initWithContentsOfFile:filePath];
NSError *error;
_xmlDoc = [[GDataXMLDocument alloc] initWithData:xmlData
options:0 error:&error];
}
-(void) loadRecentPlayer{
NSArray *playerInfo = [_xmlDoc.rootElement elementsForName:#"Player"];
GDataXMLElement *currentName = (GDataXMLElement *)[playerInfo objectAtIndex:0];
playerName = currentName.stringValue;
NSLog(#"%#",playerName);
}
-(void) loadPlayerStats{
NSString *xPath;
NSArray *playerInfo;
xPath = [NSString stringWithFormat:#"//Users/Player[Name = \"%#\"]/Level",playerName];
playerInfo = [_xmlDoc.rootElement nodesForXPath:xPath error: nil];
GDataXMLElement *level = (GDataXMLElement *)[playerInfo objectAtIndex:0];
playerLevel = level.stringValue.intValue;
xPath = [NSString stringWithFormat:#"//Users/Player[Name = \"%#\"]/Experience",playerName];
playerInfo = [_xmlDoc.rootElement nodesForXPath:xPath error: nil];
GDataXMLElement *exp = (GDataXMLElement *)[playerInfo objectAtIndex:0];
playerExp = exp.stringValue.intValue;
xPath = [NSString stringWithFormat:#"//Users/Player[Name = \"%#\"]/Inventory/CardID",playerName];
playerInfo = [_xmlDoc.rootElement nodesForXPath:xPath error: nil];
for(id obj in playerInfo){
GDataXMLElement *card = (GDataXMLElement *)obj;
[playerInventory addObject: card.stringValue.intValue];
NSLog(#"%d",card.stringValue.intValue);
}
NSLog(#"%#",playerInventory);
}
+(Player *)currentPlayer{
if (sharedInstance == nil){
sharedInstance = [[self alloc] init];
}
return sharedInstance;
}
- (NSString *)dataFilePath:(BOOL)forSave {
return [[NSBundle mainBundle] pathForResource:#"userData" ofType:#"xml"];
}
#end

Answer 1

change
#synthesize playerInventory = _ playerInventory;
and allocate like following
_playerInventory = [[NSMutableArray alloc] init];